US3552848A - Xerographic plate - Google Patents

Xerographic plate Download PDF

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Publication number
US3552848A
US3552848A US714135A US3552848DA US3552848A US 3552848 A US3552848 A US 3552848A US 714135 A US714135 A US 714135A US 3552848D A US3552848D A US 3552848DA US 3552848 A US3552848 A US 3552848A
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Prior art keywords
drum
xerographic
plate
layer
selenium
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Expired - Lifetime
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US714135A
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English (en)
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Edward M Van Wagner
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Xerox Corp
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Xerox Corp
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/14—Inert intermediate or cover layers for charge-receiving layers
    • G03G5/142—Inert intermediate layers
    • G03G5/144—Inert intermediate layers comprising inorganic material
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/28—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which projection is obtained by line scanning
    • G03G15/30—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which projection is obtained by line scanning in which projection is formed on a drum
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/10—Bases for charge-receiving or other layers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/10—Bases for charge-receiving or other layers
    • G03G5/102—Bases for charge-receiving or other layers consisting of or comprising metals
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/14—Inert intermediate or cover layers for charge-receiving layers

Definitions

  • a xerographic apparatus having a photosensitive member in the form of a xerographic drum, said drum having a conductive substrate, a thin layer of chromium contained on said substrate, and a layer of photoconductive insulating amorphous selenium covering the central portion of said chromium coated drum leaving the two peripheral edges of said drum coated only with a chromium layer, means for forming a latent electrostatic image on the photoconductive insulating layer, developer means including a developer housing for developing said latent electrostatic image, means adapted to form a contact seal between a portion of said developer housing and a portion of the chromium coated edges of the xerographic drum, and means to move said xerographic drum with respect to said imaging and developer means.
  • This invention relates in general to xerography and in particular to an improved xerographic plate; and this application is a division of application Ser. No. 311,476, filed Sept. 25, 1963 (now abandoned).
  • an electrostatic latent image is formed on a photoconductive insulating layer and is developed through the deposition thereon of finely divided electroscopic material.
  • the image may be fixed in place or transferred to a sheet of copy paper where it is permanently fixed.
  • the photoconductive insulating layer which is referred to in the art as a plate regardless of its shape or flexibility, is first charged to sensitize it and is then exposed to a light image or other pattern of activating electromagnetic radiation which serves to dissipate the charge in radiation struck areas, thus forming a charge pattern which conforms to the electromagnetic radiation pattern which impinges upon the plate.
  • This charge pattern is then developed or made visible by the chargewise deposition on the plate of an electroscopic or electrostatically attract-able, finely divided, colored material which is referred to in the art as toner.
  • the apparatus could be redesigned to prevent wear so that different materials might be employed in the fabrication of the xerographic drums to reduce wear on the drums and facilitate the refurbishing operation, it has generally been found that these changes cannot be made because of great losses in system efiiciency which result from them.
  • the material employed as the substrate for the xerographic plate has been found to have critical effects on the electrical properties and consequently upon the xerographic operability of the xerographic plate.
  • Another object of this invention is to define a xerographic plate which is capable of being easily refurbished without significant changes in its final dimensions and without loss in its xerographic image forming capabilities.
  • a still further object of this invention is to define a novel xerographic plate which is much less subject to wear in commercially available xerographic equipment.
  • FIG. 1 is a side cross sectional view of a reusable plate type xerographic copying apparatus.
  • FIG. 2 is a partially cut away isometric view of the xerographic plate and developing elements of the apparatus illustrated in FIG. 1.
  • FIG. 3 is a sectional view of the improved xerographic plate according to this invention extending to the end of the xerographic drum as seen in FIG. 2.
  • FIG. 1 there is illustrated an exemplary type of automatic, continuous, xerographic copier of a type now in wide commercial use utilizing a cylindrical plate generally designated 11 made up of a grounded substrate layer 12, an interfacial barrier layer 13 and a photoconductive insulating layer 14.
  • a cylindrical plate generally designated 11 made up of a grounded substrate layer 12, an interfacial barrier layer 13 and a photoconductive insulating layer 14.
  • the plate 11 is illustrated in the form of a rigid cylinder it may take many other shapes including that of a flat plate, a polygon, or an ellipse, or the like and may be flexible as well as rigid. Thus, for example, it might take the form of a flexible endless belt.
  • the xerographic plate 11 is first charged to sensitize it. This is accomplished with a charging unit 16 connected to a source of high potential 17.
  • the charging unit 16 contains one or more wire filaments which are connected to the potential source and operate on the corona discharge technique as described in U.S. Pats. 2,588,699 to Carlson and 2,777,957 to Walkup.
  • this technique consists of spacing a filament slightly from the surface of the xerographic plate having its conductive base grounded and applying a high potential to the filament so that a corona discharge occurs between the filament and the plate, thereby serving to deposit charge on the plate surface to raise its level of potential with respect to ground.
  • Other charging techniques known in the xerographic art such as induction charging as described, for example, in U.S. Pat. 2,833,930 to Walkup may also be employed for the purpose of sensitizing the xerographic plate.
  • the cylindrical xerographic plate is generally rotated at a uniform velocity in a direction indicated by the arrow in FIG. 1 so that after portions of the drum periphery pass beneath the charging unit 16 and have been uniformly charged, they come beneath a projector 18 or other means for exposing the charged plate to the image to be reproduced.
  • This exposure step serves to dissipate charge in surface areas of the cylindrical xerographic plate which are exposed to light from the image exposure resulting in a residual charge pattern on the xerographic plate 11 corresponding to the original image to be reproduced.
  • the drum surface moves past a developing unit generally designated 19.
  • the illustrated developing unit is of the cascade type which includes an outer container or cover 21 with a trough at its bottom containing a supply of developing material 22.
  • the developing material is picked up from the bottom of the container 21 and dumped or cascaded over the drum surface by a number of buckets 23 on an endless driven conveyor belt 24.
  • This development technique which is more fully described in U.S. Pat. 2,618,- 552 to Wise and 2,618,551 to Walkup utilizes a two element developing mixture including finely divided, colored, marking particles or as it is known in the art, toner and grossly larger carrier beads.
  • the carrier beads serve both to deagglomerate the toner particles and to charge the toner by virtue of the rubbing together of the carrier and toner in the apparatus and their relative positions of the toner and carrier materials in the triboelectric series.
  • the carrier beads with toner particles clinging to them are cascaded over the drum surface, the electrostatic fields from the charge pattern on the drum pull toner particles off the carrier beads serving to develop the residual charge pattern making up the image.
  • the carrier beads, along with any toner particles not used to develop the image then fall back into the bottom of container 21.
  • the toner and carrier materials are selected so that the charge triboelectrically imparted to them is opposite in polarity to the residual charge pattern on the xerographic plate 11.
  • the xerographic plate fabricated according to this invention may be used in xerographic copying apparatus employing development systems other than the illustrated cascade system, although it is of particular value when employed in conjunction with a cascade development system or other systems employing friction seals because of its resistance to wear and erosion caused by the developer seals as will be more fully explained in connection with FIG. 2.
  • magnetic brush development as described in US. Pat. 3,015,305 to Hall, skid development as described in U.S. Pat. 2,895,847 to Mayo, or powder cloud development as described in U.S. Pat.
  • 2,918,910 to Carlson may be substituted along with any one of the number of other development techniques well known in the art for the cascade development unit 19 illustrated and described above.
  • the plate hearing this developed powder image moves around until it comes into contact with a copy web 26 which is pressed up against the drum surface by two idle rollers 27 so that the web moves at the same speed as the periphery of the drum.
  • a transfer unit 28 is placed behind the web and spaced slightly from it between the rollers 27. This unit is similar in nature to the plate charging mechanism 16, 17 and also operates on the corona discharge principle.
  • the transfer unit is connected to a source of high potential 29 of the same polarity as that employed in the charging device so that it deposits charge on the back of web 26 which is of the same polarity as the charge on the xerographic plate and is opposite in polarity to the toner particles utilized in developing the drum.
  • a source of high potential 29 of the same polarity as that employed in the charging device so that it deposits charge on the back of web 26 which is of the same polarity as the charge on the xerographic plate and is opposite in polarity to the toner particles utilized in developing the drum.
  • this corona discharge to the back of the web 26 serves to transfer the developed toner particle image from the surface of the drum to the web 26. It should be noted at this point that may other transfer techniques may be utilized with this invention.
  • a roller connected to a source of high potential opposite in polarity to the toner particles may be placed immediately behind the copy web or the copy web may itself be adhesive to the toner particles.
  • the web moves beneath a fixing unit 31 which serves to fuse or permanently fix the toner image to the web.
  • a resistance heating type fixer is illustrated for use with a toner including a resinous component; however other techniques known in the xerographic arts may also be utilized including the subjection of the toner particle image to a solvent vapor or the spraying over the toner image with an adhesive overcoating. After fixing the web is rewound on a coil 32 for later use.
  • the xerographic plate 11 must have certain electrical properties.
  • the xerographic plate must be capable of holding charge from the time when it is sensitized by the corona generating unit 16, at least until the time when it is developed by the cascade developing unit 19.
  • the xerographic plate must have low charge dark decay.
  • the plate must be capable of dissipating charge relatively rapidly upon exposure to the light or other activating electromagnetic radiation to which it is sensitive so that non-image areas of the plate will not contain developable residual charge when the plate passes beneath the developing unit 19.
  • xerographic plates in commercial use today generally employ a substrate such as aluminum bearing a thin interfacial barrier layer such as aluminum oxide between the luminum and selenium layers.
  • a thin interfacial barrier layer such as aluminum oxide between the luminum and selenium layers.
  • the interfacial barrier layer is of such a nature as to allow charge dissipation from the plate upon exposure of the charged plate to activating electromagnetic radiation.
  • FIG. 2 there is illustrated in isometric, a portion of the FIG. 1 apparatus including the cylindrical xerographic drum 11 and the cascade developing unit 19.
  • the conductive drum substrate 12 and the interface layer 13 extend out beyond the photoconductive insulating layer 14 and the end seals 34 of the developer housing 21 make sliding contact with the end portion of the drum.
  • Seals of the type shown in FIG. 2 are provided at both ends of the drum although only one seal is shown in FIG. 2. Since the lower portion or collecting lip on the trough of the developer housing 21 is below the point where residual developing material falls ofl?
  • end seals 34 are usually fabricated of some foam material such as foamed polyurethane or other materials capable of forming a good seal with the surface of the drum substrate, carrier beads and/or toner particles sometimes become lodged between these end seals and the surface of the drum and in past instances when the drum and interface layer were formed of aluminum and aluminum oxide respectively, these particles have caused significant scoring of the drum surface as the drum rtates with these developing materials between it and the end seals. Since these carrier beads generally take the form of coated glass, this scoring of the drums is frequently severe enough to impair the effectiveness of the seal over long periods of drum use.
  • foam material such as foamed polyurethane or other materials capable of forming a good seal with the surface of the drum substrate
  • carrier beads and/or toner particles sometimes become lodged between these end seals and the surface of the drum and in past instances when the drum and interface layer were formed of aluminum and aluminum oxide respectively, these particles have caused significant scoring of the drum surface as the drum rtates with these developing materials between it and the end seals. Since these
  • the cylindrical substrate is a precision made component which is machined specifically for mounting in the xerographic copying apparatus, large savings can be made if the selenium photoconductive insulating layer can be stripped from the drum and a new coating of amorphous selenium can be reapplied to the drum surface rendering it ready for reuse in thousands of additional cycles of machine operation.
  • Several disadvantages have been found when it was attempted to refurbish the commercially utilized aluminum based xerographic drums for more than a few times.
  • the bond between the evaporated amorphous selenium photoconductive insulating layer and the substrate and interface layers of aluminum and aluminum oxide was found to be so good that removal of the selenium could only be readily accomplished by machining the drums on a lathe and even in those occasional instances where the selenium can be removed by other techniques, machining of the drum blank is required to remove grooves, pits, and the like caused by scoring of the ends of the drum by developer caught between the end seals and the drum surface. Since the diameter of the drum blank is reduced by a certain finite amount during each machining operation, aluminum drums could be refurbished on average only about twice before the drum blanks became unacceptably out of tolerance requirements for use in the machine.
  • the drum must then be cleaned to remove any irregular surface oxides as by dipping it in a nitric acid solution whereupon a new and highly uniform layer of aluminum oxide is then formed on the drum surface by heating over an extended period or by any one of a number of various chemical treatments.
  • This prior art type aluminum drum blank is then ready for recoating with amorphous selenium which constitutes the final step in the refurbishing process.
  • this xerographic plate consists of a supporting or substrate layer 36 which is preferably at least one or two orders of magnitude more conductive than amorphous selenium layer 38 and may advantageously be formed of a conductive metal or alloy such as steel.
  • a thin but uniform layer of chrome 37 overlies the substrate below selenium layer 38 which covers only the center of the chrome layer.
  • this chrome layer acts as an excellent xerographic plate interface.
  • the chromium layer should preferably be at least thick enough to impart hardness to the surface of the drum blank and thereby prevent abrasion or erosion of the ends of the drum when they come into contact with the developer seals and trapped carrier beads in the developer seals during operation of the xerographic apparatus which employs the drum.
  • chrome layers on the order of from about .0005 to about .001 inch are required.
  • thinner layers of chrome which do not range up into the hard chrome coating region may be employed to satisfy the electrical requirements of the interfacial layer.
  • the chrome may be deposited by any of the known chrome surface coating techniques such as, for example, electroplating. If electroplating is em ployed, nickel or copper undercoating may be used to provide good adhesion between the chromium and its steel substrate and to facilitate the electroplating. When electroplating is utilized to apply the chromium layer in thicknesses in the hard chromium range the plating operation should be followed by heat treatment at about from 300 to about 500 F. for from about 1 to 5 hours to outgas the chromium layer and prevent hydrogen embrittlement which might otherwise result from the electrolytic coating process.
  • electroplating is utilized to apply the chromium layer in thicknesses in the hard chromium range the plating operation should be followed by heat treatment at about from 300 to about 500 F. for from about 1 to 5 hours to outgas the chromium layer and prevent hydrogen embrittlement which might otherwise result from the electrolytic coating process.
  • a layer of amorphous selenium is applied to the chromium to serve as the photoconductive insulating layer of the plate.
  • This layer will generally range in thickness from about 10 to about 200 microns depending upon its mode of operation, the type of activating electromagnetic radiation to which it is exposed and similar factors.
  • the chrome interface drum described in connection with FIG. 3 above may be refurbished by a method which is both fast and simple as compared to the refurbishing method of the prior art type drum.
  • refurbishing may be carried out a great number of times without degradation of the drum blank since it need not be turned down on a lathe.
  • this refurbishing process involves merely stripping the exhausted selenium from the chrome plated drum by bringing a strong adhesive tape into contact with the selenium surface and then pulling the adhesive tape away from the drum to demove the selenium followed by a recoating of a fresh layer of selenium onto the chrome surface.
  • the selenium may be removed by a jet spray process which involves causing a very high pressure spray of water to impinge on the selenium. It has been found that the chrome to selenium bond is not strong enough to withstand these types of removal processes; however, it is sufficiently strong so that the selenium stays on the chrome base without flaking off or otherwise being removed during operation in the xerographic copying apparatus described. Tests to 20,000 cycles and more of drum operation in this type of copying device have failed to disclose one instance of selenium-chrome bond failure.
  • Any residual small feathers of selenium which may be left by the stripping process can be removed by a hot sodium sulfite bath.
  • a xerographic apparatus comprising a photosensitive member in the form of a cylindrical drum, said drum having a conductive substrate coated with a thin uniform layer of chromium on the outer surface of said substrate, a photoconductive insulating layer of amorphous selenium covering the major portion of said chromium layer leaving the two peripheral edges of said drum coated only with chromium, means for forming a latent electrostatic image on the photoconductive insulating surface of said drum, developer means including a developer housing to develop said latent electrostatic image, said developer housing including a contact seal, with said seal being in sliding contact with said chromium coated edges, and means to move said xerographic drum with respect to said imaging and developer means.

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US714135A 1963-09-25 1967-11-20 Xerographic plate Expired - Lifetime US3552848A (en)

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Cited By (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709603A (en) * 1969-11-07 1973-01-09 Katsuragawa Denki Kk Electrophotographic copying machine
US4516849A (en) * 1982-04-04 1985-05-14 Mita Industrial Co., Ltd. Cleaning device for an electrostatic photographic copying machine
US4616919A (en) * 1985-09-05 1986-10-14 International Business Machines Corporation Non-contact developer seal
US5470271A (en) * 1992-01-02 1995-11-28 Xerox Corporation Flexible belt reclaiming
WO2001079650A1 (en) * 2000-04-13 2001-10-25 Weatherford/Lamb, Inc. Drillable drill bit nozzle
US20020189863A1 (en) * 1999-12-22 2002-12-19 Mike Wardley Drilling bit for drilling while running casing
US20030141111A1 (en) * 2000-08-01 2003-07-31 Giancarlo Pia Drilling method
US20030164251A1 (en) * 2000-04-28 2003-09-04 Tulloch Rory Mccrae Expandable apparatus for drift and reaming borehole
US20030173073A1 (en) * 2000-04-17 2003-09-18 Weatherford/Lamb, Inc. Top drive casing system
US20030217865A1 (en) * 2002-03-16 2003-11-27 Simpson Neil Andrew Abercrombie Bore lining and drilling
US20040069500A1 (en) * 2001-05-17 2004-04-15 Haugen David M. Apparatus and methods for tubular makeup interlock
US20040108142A1 (en) * 1994-10-14 2004-06-10 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040112646A1 (en) * 1994-10-14 2004-06-17 Vail William Banning Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040118613A1 (en) * 1994-10-14 2004-06-24 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040129456A1 (en) * 1994-10-14 2004-07-08 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040140128A1 (en) * 1994-10-14 2004-07-22 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040173357A1 (en) * 1998-08-24 2004-09-09 Weatherford/Lamb, Inc. Apparatus for connecting tublars using a top drive
US20040194965A1 (en) * 1998-12-24 2004-10-07 Weatherford/Lamb, Inc. Apparatus and method for facilitating the connection of tubulars using a top drive
US20040216892A1 (en) * 2003-03-05 2004-11-04 Giroux Richard L Drilling with casing latch
US20040216924A1 (en) * 2003-03-05 2004-11-04 Bernd-Georg Pietras Casing running and drilling system
US20040216925A1 (en) * 1998-12-22 2004-11-04 Weatherford/Lamb, Inc. Method and apparatus for drilling and lining a wellbore
US20040221997A1 (en) * 1999-02-25 2004-11-11 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US20040226751A1 (en) * 2003-02-27 2004-11-18 Mckay David Drill shoe
US20040244992A1 (en) * 2003-03-05 2004-12-09 Carter Thurman B. Full bore lined wellbores
US20040245020A1 (en) * 2000-04-13 2004-12-09 Weatherford/Lamb, Inc. Apparatus and methods for drilling a wellbore using casing
US20040251055A1 (en) * 2002-07-29 2004-12-16 Weatherford/Lamb, Inc. Adjustable rotating guides for spider or elevator
US20040251025A1 (en) * 2003-01-30 2004-12-16 Giroux Richard L. Single-direction cementing plug
US20040251050A1 (en) * 1997-09-02 2004-12-16 Weatherford/Lamb, Inc. Method and apparatus for drilling with casing
US20040262013A1 (en) * 2002-10-11 2004-12-30 Weatherford/Lamb, Inc. Wired casing
US20050000691A1 (en) * 2000-04-17 2005-01-06 Weatherford/Lamb, Inc. Methods and apparatus for handling and drilling with tubulars or casing
US20050000696A1 (en) * 2003-04-04 2005-01-06 Mcdaniel Gary Method and apparatus for handling wellbore tubulars
US20050121232A1 (en) * 1998-12-22 2005-06-09 Weatherford/Lamb, Inc. Downhole filter
US20050194188A1 (en) * 2003-10-03 2005-09-08 Glaser Mark C. Method of drilling and completing multiple wellbores inside a single caisson
US20050205250A1 (en) * 2002-10-11 2005-09-22 Weatherford/Lamb, Inc. Apparatus and methods for drilling with casing
US20050217858A1 (en) * 2002-12-13 2005-10-06 Weatherford/Lamb, Inc. Apparatus and method of drilling with casing
US20050269105A1 (en) * 1998-07-22 2005-12-08 Weatherford/Lamb, Inc. Apparatus for facilitating the connection of tubulars using a top drive
US20060011353A1 (en) * 1998-12-24 2006-01-19 Weatherford/Lamb, Inc. Apparatus and methods for facilitating the connection of tubulars using a top drive
US20060032638A1 (en) * 2004-07-30 2006-02-16 Giroux Richard L Apparatus and methods of setting and retrieving casing with drilling latch and bottom hole assembly
US7013997B2 (en) 1994-10-14 2006-03-21 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7036610B1 (en) 1994-10-14 2006-05-02 Weatherford / Lamb, Inc. Apparatus and method for completing oil and gas wells
US20060124306A1 (en) * 2000-01-19 2006-06-15 Vail William B Iii Installation of one-way valve after removal of retrievable drill bit to complete oil and gas wells
US20060196695A1 (en) * 2002-12-13 2006-09-07 Giroux Richard L Deep water drilling with casing
US7131505B2 (en) 2002-12-30 2006-11-07 Weatherford/Lamb, Inc. Drilling with concentric strings of casing
US7219744B2 (en) 1998-08-24 2007-05-22 Weatherford/Lamb, Inc. Method and apparatus for connecting tubulars using a top drive
US7228901B2 (en) 1994-10-14 2007-06-12 Weatherford/Lamb, Inc. Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7284617B2 (en) 2004-05-20 2007-10-23 Weatherford/Lamb, Inc. Casing running head
US20070261850A1 (en) * 2006-05-12 2007-11-15 Giroux Richard L Stage cementing methods used in casing while drilling
US20070267221A1 (en) * 2006-05-22 2007-11-22 Giroux Richard L Methods and apparatus for drilling with casing
US7509722B2 (en) 1997-09-02 2009-03-31 Weatherford/Lamb, Inc. Positioning and spinning device
US7617866B2 (en) 1998-08-24 2009-11-17 Weatherford/Lamb, Inc. Methods and apparatus for connecting tubulars using a top drive
US7650944B1 (en) 2003-07-11 2010-01-26 Weatherford/Lamb, Inc. Vessel for well intervention
US7730965B2 (en) 2002-12-13 2010-06-08 Weatherford/Lamb, Inc. Retractable joint and cementing shoe for use in completing a wellbore
USRE42877E1 (en) 2003-02-07 2011-11-01 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
CN109623672A (zh) * 2018-11-29 2019-04-16 天津瑞驰船舶机械有限公司 油桶翻新预处理流水线及其运行方法

Cited By (100)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709603A (en) * 1969-11-07 1973-01-09 Katsuragawa Denki Kk Electrophotographic copying machine
US4516849A (en) * 1982-04-04 1985-05-14 Mita Industrial Co., Ltd. Cleaning device for an electrostatic photographic copying machine
US4616919A (en) * 1985-09-05 1986-10-14 International Business Machines Corporation Non-contact developer seal
US5470271A (en) * 1992-01-02 1995-11-28 Xerox Corporation Flexible belt reclaiming
US20040112646A1 (en) * 1994-10-14 2004-06-17 Vail William Banning Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040118613A1 (en) * 1994-10-14 2004-06-24 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20060201711A1 (en) * 1994-10-14 2006-09-14 Vail William B Iii Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7108084B2 (en) 1994-10-14 2006-09-19 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7040420B2 (en) 1994-10-14 2006-05-09 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7036610B1 (en) 1994-10-14 2006-05-02 Weatherford / Lamb, Inc. Apparatus and method for completing oil and gas wells
US7228901B2 (en) 1994-10-14 2007-06-12 Weatherford/Lamb, Inc. Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040108142A1 (en) * 1994-10-14 2004-06-10 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7234542B2 (en) 1994-10-14 2007-06-26 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20060185906A1 (en) * 1994-10-14 2006-08-24 Vail William B Iii Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040124015A1 (en) * 1994-10-14 2004-07-01 Vail William Banning Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040129456A1 (en) * 1994-10-14 2004-07-08 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US20040140128A1 (en) * 1994-10-14 2004-07-22 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7013997B2 (en) 1994-10-14 2006-03-21 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7165634B2 (en) 1994-10-14 2007-01-23 Weatherford/Lamb, Inc. Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7100710B2 (en) 1994-10-14 2006-09-05 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7147068B2 (en) 1994-10-14 2006-12-12 Weatherford / Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7140445B2 (en) 1997-09-02 2006-11-28 Weatherford/Lamb, Inc. Method and apparatus for drilling with casing
US20040251050A1 (en) * 1997-09-02 2004-12-16 Weatherford/Lamb, Inc. Method and apparatus for drilling with casing
US7509722B2 (en) 1997-09-02 2009-03-31 Weatherford/Lamb, Inc. Positioning and spinning device
US20050269105A1 (en) * 1998-07-22 2005-12-08 Weatherford/Lamb, Inc. Apparatus for facilitating the connection of tubulars using a top drive
US7137454B2 (en) 1998-07-22 2006-11-21 Weatherford/Lamb, Inc. Apparatus for facilitating the connection of tubulars using a top drive
US7090021B2 (en) 1998-08-24 2006-08-15 Bernd-Georg Pietras Apparatus for connecting tublars using a top drive
US7219744B2 (en) 1998-08-24 2007-05-22 Weatherford/Lamb, Inc. Method and apparatus for connecting tubulars using a top drive
US7617866B2 (en) 1998-08-24 2009-11-17 Weatherford/Lamb, Inc. Methods and apparatus for connecting tubulars using a top drive
US20040173357A1 (en) * 1998-08-24 2004-09-09 Weatherford/Lamb, Inc. Apparatus for connecting tublars using a top drive
US20050121232A1 (en) * 1998-12-22 2005-06-09 Weatherford/Lamb, Inc. Downhole filter
US7117957B2 (en) 1998-12-22 2006-10-10 Weatherford/Lamb, Inc. Methods for drilling and lining a wellbore
US20040216925A1 (en) * 1998-12-22 2004-11-04 Weatherford/Lamb, Inc. Method and apparatus for drilling and lining a wellbore
US7188687B2 (en) 1998-12-22 2007-03-13 Weatherford/Lamb, Inc. Downhole filter
US20040194965A1 (en) * 1998-12-24 2004-10-07 Weatherford/Lamb, Inc. Apparatus and method for facilitating the connection of tubulars using a top drive
US7128161B2 (en) 1998-12-24 2006-10-31 Weatherford/Lamb, Inc. Apparatus and methods for facilitating the connection of tubulars using a top drive
US20060011353A1 (en) * 1998-12-24 2006-01-19 Weatherford/Lamb, Inc. Apparatus and methods for facilitating the connection of tubulars using a top drive
US7213656B2 (en) 1998-12-24 2007-05-08 Weatherford/Lamb, Inc. Apparatus and method for facilitating the connection of tubulars using a top drive
US7311148B2 (en) 1999-02-25 2007-12-25 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US20040221997A1 (en) * 1999-02-25 2004-11-11 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US20020189863A1 (en) * 1999-12-22 2002-12-19 Mike Wardley Drilling bit for drilling while running casing
US7216727B2 (en) 1999-12-22 2007-05-15 Weatherford/Lamb, Inc. Drilling bit for drilling while running casing
US20060124306A1 (en) * 2000-01-19 2006-06-15 Vail William B Iii Installation of one-way valve after removal of retrievable drill bit to complete oil and gas wells
WO2001079650A1 (en) * 2000-04-13 2001-10-25 Weatherford/Lamb, Inc. Drillable drill bit nozzle
US7334650B2 (en) 2000-04-13 2008-02-26 Weatherford/Lamb, Inc. Apparatus and methods for drilling a wellbore using casing
US20070056774A9 (en) * 2000-04-13 2007-03-15 Weatherford/Lamb, Inc. Apparatus and methods for drilling a wellbore using casing
US20040245020A1 (en) * 2000-04-13 2004-12-09 Weatherford/Lamb, Inc. Apparatus and methods for drilling a wellbore using casing
US6848517B2 (en) 2000-04-13 2005-02-01 Weatherford/Lamb, Inc. Drillable drill bit nozzle
US20070119626A9 (en) * 2000-04-13 2007-05-31 Weatherford/Lamb, Inc. Apparatus and methods for drilling a wellbore using casing
US20030173073A1 (en) * 2000-04-17 2003-09-18 Weatherford/Lamb, Inc. Top drive casing system
US7712523B2 (en) 2000-04-17 2010-05-11 Weatherford/Lamb, Inc. Top drive casing system
US20050000691A1 (en) * 2000-04-17 2005-01-06 Weatherford/Lamb, Inc. Methods and apparatus for handling and drilling with tubulars or casing
US7325610B2 (en) 2000-04-17 2008-02-05 Weatherford/Lamb, Inc. Methods and apparatus for handling and drilling with tubulars or casing
US20030164251A1 (en) * 2000-04-28 2003-09-04 Tulloch Rory Mccrae Expandable apparatus for drift and reaming borehole
US7100713B2 (en) 2000-04-28 2006-09-05 Weatherford/Lamb, Inc. Expandable apparatus for drift and reaming borehole
US7093675B2 (en) 2000-08-01 2006-08-22 Weatherford/Lamb, Inc. Drilling method
US20030141111A1 (en) * 2000-08-01 2003-07-31 Giancarlo Pia Drilling method
US6938697B2 (en) 2001-05-17 2005-09-06 Weatherford/Lamb, Inc. Apparatus and methods for tubular makeup interlock
US20040069500A1 (en) * 2001-05-17 2004-04-15 Haugen David M. Apparatus and methods for tubular makeup interlock
US20040173358A1 (en) * 2001-05-17 2004-09-09 Weatherford/Lamb, Inc. Apparatus and methods for tubular makeup interlock
US7073598B2 (en) 2001-05-17 2006-07-11 Weatherford/Lamb, Inc. Apparatus and methods for tubular makeup interlock
US20030217865A1 (en) * 2002-03-16 2003-11-27 Simpson Neil Andrew Abercrombie Bore lining and drilling
US7004264B2 (en) 2002-03-16 2006-02-28 Weatherford/Lamb, Inc. Bore lining and drilling
US20040251055A1 (en) * 2002-07-29 2004-12-16 Weatherford/Lamb, Inc. Adjustable rotating guides for spider or elevator
US7303022B2 (en) 2002-10-11 2007-12-04 Weatherford/Lamb, Inc. Wired casing
US7090023B2 (en) 2002-10-11 2006-08-15 Weatherford/Lamb, Inc. Apparatus and methods for drilling with casing
US20040262013A1 (en) * 2002-10-11 2004-12-30 Weatherford/Lamb, Inc. Wired casing
US20050205250A1 (en) * 2002-10-11 2005-09-22 Weatherford/Lamb, Inc. Apparatus and methods for drilling with casing
US7730965B2 (en) 2002-12-13 2010-06-08 Weatherford/Lamb, Inc. Retractable joint and cementing shoe for use in completing a wellbore
US7938201B2 (en) 2002-12-13 2011-05-10 Weatherford/Lamb, Inc. Deep water drilling with casing
US20050217858A1 (en) * 2002-12-13 2005-10-06 Weatherford/Lamb, Inc. Apparatus and method of drilling with casing
US20060196695A1 (en) * 2002-12-13 2006-09-07 Giroux Richard L Deep water drilling with casing
US7083005B2 (en) 2002-12-13 2006-08-01 Weatherford/Lamb, Inc. Apparatus and method of drilling with casing
US20100139978A9 (en) * 2002-12-13 2010-06-10 Giroux Richard L Deep water drilling with casing
US7131505B2 (en) 2002-12-30 2006-11-07 Weatherford/Lamb, Inc. Drilling with concentric strings of casing
US20040251025A1 (en) * 2003-01-30 2004-12-16 Giroux Richard L. Single-direction cementing plug
US7128154B2 (en) 2003-01-30 2006-10-31 Weatherford/Lamb, Inc. Single-direction cementing plug
USRE42877E1 (en) 2003-02-07 2011-11-01 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US7096982B2 (en) 2003-02-27 2006-08-29 Weatherford/Lamb, Inc. Drill shoe
US20040226751A1 (en) * 2003-02-27 2004-11-18 Mckay David Drill shoe
US20040216892A1 (en) * 2003-03-05 2004-11-04 Giroux Richard L Drilling with casing latch
US20040216924A1 (en) * 2003-03-05 2004-11-04 Bernd-Georg Pietras Casing running and drilling system
US7191840B2 (en) 2003-03-05 2007-03-20 Weatherford/Lamb, Inc. Casing running and drilling system
US7360594B2 (en) 2003-03-05 2008-04-22 Weatherford/Lamb, Inc. Drilling with casing latch
US7413020B2 (en) 2003-03-05 2008-08-19 Weatherford/Lamb, Inc. Full bore lined wellbores
US20040244992A1 (en) * 2003-03-05 2004-12-09 Carter Thurman B. Full bore lined wellbores
US20050000696A1 (en) * 2003-04-04 2005-01-06 Mcdaniel Gary Method and apparatus for handling wellbore tubulars
US7370707B2 (en) 2003-04-04 2008-05-13 Weatherford/Lamb, Inc. Method and apparatus for handling wellbore tubulars
US7650944B1 (en) 2003-07-11 2010-01-26 Weatherford/Lamb, Inc. Vessel for well intervention
US20050194188A1 (en) * 2003-10-03 2005-09-08 Glaser Mark C. Method of drilling and completing multiple wellbores inside a single caisson
US7264067B2 (en) 2003-10-03 2007-09-04 Weatherford/Lamb, Inc. Method of drilling and completing multiple wellbores inside a single caisson
US7284617B2 (en) 2004-05-20 2007-10-23 Weatherford/Lamb, Inc. Casing running head
US7503397B2 (en) 2004-07-30 2009-03-17 Weatherford/Lamb, Inc. Apparatus and methods of setting and retrieving casing with drilling latch and bottom hole assembly
US20060032638A1 (en) * 2004-07-30 2006-02-16 Giroux Richard L Apparatus and methods of setting and retrieving casing with drilling latch and bottom hole assembly
US20070261850A1 (en) * 2006-05-12 2007-11-15 Giroux Richard L Stage cementing methods used in casing while drilling
US7857052B2 (en) 2006-05-12 2010-12-28 Weatherford/Lamb, Inc. Stage cementing methods used in casing while drilling
US20070267221A1 (en) * 2006-05-22 2007-11-22 Giroux Richard L Methods and apparatus for drilling with casing
US8276689B2 (en) 2006-05-22 2012-10-02 Weatherford/Lamb, Inc. Methods and apparatus for drilling with casing
CN109623672A (zh) * 2018-11-29 2019-04-16 天津瑞驰船舶机械有限公司 油桶翻新预处理流水线及其运行方法
CN109623672B (zh) * 2018-11-29 2021-04-06 上海丛麟环保科技股份有限公司 油桶翻新预处理流水线的运行方法

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