US3154414A - Image removal - Google Patents

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Publication number
US3154414A
US3154414A US22670A US2267060A US3154414A US 3154414 A US3154414 A US 3154414A US 22670 A US22670 A US 22670A US 2267060 A US2267060 A US 2267060A US 3154414 A US3154414 A US 3154414A
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US
United States
Prior art keywords
photoconductor
sheet
zinc oxide
heated
sheet material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US22670A
Inventor
Tulagin Vsevolod
George H Kolb
Donald K Meyer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL263727D priority Critical patent/NL263727A/xx
Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Priority to US22670A priority patent/US3154414A/en
Priority to ES0266306A priority patent/ES266306A1/en
Priority to GB12591/61A priority patent/GB963433A/en
Priority to CH451961A priority patent/CH399175A/en
Priority to DEM48721A priority patent/DE1263510B/en
Priority to BE602731A priority patent/BE602731A/en
Priority to FR859113A priority patent/FR1286453A/en
Application granted granted Critical
Publication of US3154414A publication Critical patent/US3154414A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
    • G03G5/0622—Heterocyclic compounds
    • G03G5/0624—Heterocyclic compounds containing one hetero ring
    • G03G5/0635—Heterocyclic compounds containing one hetero ring being six-membered
    • G03G5/0638—Heterocyclic compounds containing one hetero ring being six-membered containing two hetero atoms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G11/00—Selection of substances for use as fixing agents
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G17/00—Electrographic processes using patterns other than charge patterns, e.g. an electric conductivity pattern; Processes involving a migration, e.g. photoelectrophoresis, photoelectrosolography; Processes involving a selective transfer, e.g. electrophoto-adhesive processes; Apparatus essentially involving a single such process
    • G03G17/02—Electrographic processes using patterns other than charge patterns, e.g. an electric conductivity pattern; Processes involving a migration, e.g. photoelectrophoresis, photoelectrosolography; Processes involving a selective transfer, e.g. electrophoto-adhesive processes; Apparatus essentially involving a single such process with electrolytic development
    • 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
    • G03G5/005—Materials for treating the recording members, e.g. for cleaning, reactivating, polishing
    • 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
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
    • G03G5/0601—Acyclic or carbocyclic compounds
    • G03G5/0612—Acyclic or carbocyclic compounds containing nitrogen
    • G03G5/0614—Amines
    • G03G5/06142—Amines arylamine
    • 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
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
    • G03G5/0601—Acyclic or carbocyclic compounds
    • G03G5/062—Acyclic or carbocyclic compounds containing non-metal elements other than hydrogen, halogen, oxygen or nitrogen
    • 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
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
    • G03G5/0664—Dyes
    • 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
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/09—Sensitisors or activators, e.g. dyestuffs

Definitions

  • the photoconductive material In the production of the images on a photoconductive sheet material, the photoconductive material is selectively exposed to a light source of the visible spectrum so that certain areas are rendered conductive after exposure. This retained conductivity makes possible the subsequent production of the images by electrolytic means. Where two or more successive images are to be applied the photoconductive sheet material must be restored to a dark adapted state before being re-exposed. Heretofore, photoconductive sheet materials have been restored to dark adapted state by heating the photoconductive sheet material at an elevated temperature or by storage in the dark for an extended period of time.
  • Photoconductor sheet materials of the type contemplated by this invention are prepared as follows:
  • a Waring Blendor mixer is employed to thoroughly blend the following ingredients over a period of minutes:
  • Methyl-isobutyl ketone -Q 139 Zinc oxide (U.S.P. 12) having a particle size of less M than 40 microns 252
  • Binder [30% toluene solution of butadiene (30 parts by weight) and styrene (70 parts by weight) copolyrner] 210 sensitizing dyes are then added to the blend as 0.5% methanol solutions in order to dye-sensitize the photoconductor sheet as follows:
  • this sheet When dry and fully dark adapted, this sheet was used to produce reproductions and had high response spectral bands at 460-465 mu, 560 mu and 660 mu.
  • photoconductor sheet backings prepared by vapor deposition of a metal, such as aluminum, on a paper or plastic backing are especially useful.
  • a metal such as aluminum
  • Polyethylene terephthalate films (5 mil) are preferred.
  • the negative electrode from a direct current power supply is attached to the aluminum backing of the photoconductor sheet.
  • the sheet was then selectively exposed to a photographic image and titanium dioxide deposited on the exposed areas by repeating steps 3 to 5 above, using as the solution a suspension of titanium dioxide in a dilute aqueous solution of the thiuronium salt prepared by reacting N tetradecyl p-chloromethylbenzenesulfonamide and N,N,N,N-tetramethyl thiourea.
  • the titanium dioxide is deposited on the conductive areas of the photoconductor-cathode, which are areas selectively exposed to the photographic image, concurrently with the decomposition of thiuronium salt, resulting in a positive bluegreen print.
  • a process for restoring a photoconductor electrolytically developable sheet material having only latent conductivity images thereon to its dark adapted state and for washing the surface thereof which comprises contacting an organic photoconductor bonded to an electrically conductive carrier with liquid water heated to at least 100 F. and cooling the heated photoconductor to ambient temperature.
  • a process for restoring a photoconductor electrolytically developable sheet material having only latent conductivity images thereon to its dark adapted state and for washing the surface thereof which comprises contacting an organic photoconductor bonded to an electrically conductive carrier with liquid water heated to at least 100 F., drying the heated photoconductor and cooling the dry photoconductor to ambient temperature.
  • a process for restoring an electrolytically developable zinc oxide photoconductor sheet material having only latent conductivity images thereon to its dark adapted state and for washing the surface thereof which comprises contacting a zinc oxide photoconductor bonded to an electrically conductive carrier liquid with water heated to at least F. and cooling the heated zinc oxide to ambient temperature.
  • a process for restoring an electrolytically developable zinc oxide photoconductor sheet material having only latent conductivity images thereon to its dark adapted state and for Washing the surface thereof which comprises contacting a Zinc oxide photoconductor bonded to an electrically conductive carrier liquid with water heated to at least 100 F., drying the heated zinc oxide and cooling the dry zinc oxide to ambient temperature.
  • a process for dark adapting and washing a zinc oxide photoconductor sheet material which comprises contacting a zinc oxide photoconductor bonded to an electrically conductive carrier with liquid water heated to at least 100 F. and cooling the heated zinc oxide to ambient temperature, said steps being conducted under dark conditions.
  • a process for dark adapting and washing a zinc oxide photoconductor sheet material which comprises contacting a zinc oxide photoconductor bonded to an electrically conductive carrier with liquid water heated to at least 100 F., drying the heated zinc oxide and cooling the dry zinc oxide to ambient temperature, said steps being conducted under dark conditions.

Description

United States Patent 3,154,414 IMAGE REMOVAL Vsevoiod Tulagin, St. Paul, George H. Kalb, West St. Paul, and Donald K. Meyer, St. Paul, Minn, assignors to Minnesota Mining and Manufacturing Company, St. Paul, Minn., a corporation of Delaware No Drawing. Filed Apr. 18, 1960, Ser. No. 22,670 6 Claims. (Cl. 96-4) This invention relates to a new and useful method for removing latent images from photoconductive sheet materials and restoring them to a dark adapted state.
Successive production of latent images on a photoconductive sheet material is necessary in the preparation of colored reproductions by electrolytic deposition of colored materials on the photoconductor sheet material.
It is an object of this invention to make possible the preparation of a plurality of successive images on a photoconductive material in a simple, relatively fast, and convenient manner.
In the production of the images on a photoconductive sheet material, the photoconductive material is selectively exposed to a light source of the visible spectrum so that certain areas are rendered conductive after exposure. This retained conductivity makes possible the subsequent production of the images by electrolytic means. Where two or more successive images are to be applied the photoconductive sheet material must be restored to a dark adapted state before being re-exposed. Heretofore, photoconductive sheet materials have been restored to dark adapted state by heating the photoconductive sheet material at an elevated temperature or by storage in the dark for an extended period of time.
It has noW been discovered that the removal of the latent image and restoration of the photoconductive material to a dark adapted state is greatly accelerated if the photoconductive sheet material is heated by placing it in contact with hot water. In this manner a photoconductive sheet can be uniformly dark adapted in the matter of a few seconds by immersion in hot water. Generally speaking, the water should be heated to at least 100 F. (preferably about 140 F.) and remain in contact with the photoconductor over a period of 10 to 60 seconds.
Photoconductor sheet materials of the type contemplated by this invention are prepared as follows:
A Waring Blendor mixer is employed to thoroughly blend the following ingredients over a period of minutes:
Methyl-isobutyl ketone -Q 139 Zinc oxide (U.S.P. 12) having a particle size of less M than 40 microns 252 Binder [30% toluene solution of butadiene (30 parts by weight) and styrene (70 parts by weight) copolyrner] 210 sensitizing dyes are then added to the blend as 0.5% methanol solutions in order to dye-sensitize the photoconductor sheet as follows:
1 Color Index," 2d ed., Chorley & Pickersgill Ltd., Leeds (1956) After being blended for an additional five minutes'and filtered through a coarse sintered glass filter, the blend was coated with a doctor blade coater onto an aluminum sheet (3 mil) to a wet thickness of .006 inch.
When dry and fully dark adapted, this sheet was used to produce reproductions and had high response spectral bands at 460-465 mu, 560 mu and 660 mu.
Because of their flexibility, durability, and resistance to crease formation, photoconductor sheet backings prepared by vapor deposition of a metal, such as aluminum, on a paper or plastic backing are especially useful. Polyethylene terephthalate films (5 mil) are preferred.
An illustrative procedure employed to prepare reproductions by the electrolytic decomposition on the surface of a zinc oxide photoconductor sheet prepared as described above and to restore the photoconductor to a dark adapted state is as follows:
(1) The negative electrode from a direct current power supply is attached to the aluminum backing of the photoconductor sheet.
(2) The photoconductor sheet retained in a developer tray is exposed uniformly to a white light source by projecting an image on the photoconductor sheet with the projector having a low F stop projection range and a 500 watt tungsten projection lamp as the light source, thereby rendering the sheet conductive. Relative hu- Patented Oct. 27, 1964 midity of the atmosphere in the work area is maintained at less than 40 percent.
(3) An electrode attached to the positive terminal of the direct current power supply is placed in the developer tray.
(4) A solution of Alcian Blue 8GN (5 g.) which is described in The Chemistry of Synthetic Dyes, by K. Venkataraman, Academic Press Inc., New York, NY. (1952), dissolved in water (100 ml.) is added to the developer tray.
(5) After a total lapse of time of about 20 seconds after exposure, a 30 volt electrical current is then passed through the photoconductor and the solution for a period of seconds.
(6) The solution is removed from the developer tray and the photoconductor sheet is Washed with water heated to 140 F. for a period of seconds to restore the photoconductor to a dark adapted state and the sheet is then dried by placing it under a stream of air. The resulting sheet had been rendered blue-green by the deposited dye.
(7) The sheet was then selectively exposed to a photographic image and titanium dioxide deposited on the exposed areas by repeating steps 3 to 5 above, using as the solution a suspension of titanium dioxide in a dilute aqueous solution of the thiuronium salt prepared by reacting N tetradecyl p-chloromethylbenzenesulfonamide and N,N,N,N-tetramethyl thiourea. The titanium dioxide is deposited on the conductive areas of the photoconductor-cathode, which are areas selectively exposed to the photographic image, concurrently with the decomposition of thiuronium salt, resulting in a positive bluegreen print.
We claim:
1. A process for restoring a photoconductor electrolytically developable sheet material having only latent conductivity images thereon to its dark adapted state and for washing the surface thereof which comprises contacting an organic photoconductor bonded to an electrically conductive carrier with liquid water heated to at least 100 F. and cooling the heated photoconductor to ambient temperature.
2. A process for restoring a photoconductor electrolytically developable sheet material having only latent conductivity images thereon to its dark adapted state and for washing the surface thereof which comprises contacting an organic photoconductor bonded to an electrically conductive carrier with liquid water heated to at least 100 F., drying the heated photoconductor and cooling the dry photoconductor to ambient temperature.
3. A process for restoring an electrolytically developable zinc oxide photoconductor sheet material having only latent conductivity images thereon to its dark adapted state and for washing the surface thereof which comprises contacting a zinc oxide photoconductor bonded to an electrically conductive carrier liquid with water heated to at least F. and cooling the heated zinc oxide to ambient temperature.
4. A process for restoring an electrolytically developable zinc oxide photoconductor sheet material having only latent conductivity images thereon to its dark adapted state and for Washing the surface thereof which comprises contacting a Zinc oxide photoconductor bonded to an electrically conductive carrier liquid with water heated to at least 100 F., drying the heated zinc oxide and cooling the dry zinc oxide to ambient temperature.
5. A process for dark adapting and washing a zinc oxide photoconductor sheet material which comprises contacting a zinc oxide photoconductor bonded to an electrically conductive carrier with liquid water heated to at least 100 F. and cooling the heated zinc oxide to ambient temperature, said steps being conducted under dark conditions.
6. A process for dark adapting and washing a zinc oxide photoconductor sheet material which comprises contacting a zinc oxide photoconductor bonded to an electrically conductive carrier with liquid water heated to at least 100 F., drying the heated zinc oxide and cooling the dry zinc oxide to ambient temperature, said steps being conducted under dark conditions.
References Cited in the file of this patent UNITED STATES PATENTS 2,286,744 Leatherman June 16, 1942 2,863,767 Vyverberg et a1. Dec. 9, 1958 2,904,431 Moncriefi-Yeates Sept. 15, 1959 2,940,847 Kaprelian June 14, 1960 2,987,660 Walkup June 6, 1961 3,010,883 Johnson et al. Nov. 28, 1961 FOREIGN PATENTS 820,763 Great Britain Sept. 23, 1959 OTHER REFERENCES Perry: Chemical Engineers Handbook, McGraw- Hill, 1950; 3rd ed., pages 455-82 of interest.
Amick: RCA Review, December 1959, pages 753-769, 96-1FC.
Collins et al.: Physical Review, volume 112, No. 2, pages 388-395.
UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION atent Noo 3 154 414 October 27 1964 Vsevolod Tnlagin et al,
It is hereby certified that error appears in the above numbered patant requiring correction and that the said Letters Patent should read as :orrected below Column 3 lines -34 and 35 and lines 42 and 4L3 for "a photoconductor electrolytically developable", each electrolytically developable occurrence, read a photoconductor same column 3 lines 38 and 4L6 for "organic", each occurrence read inorganic column 4, for "carrier liquid with", each occurrence lines 5 and 13 read carrier with liquid Signed and sealed this 4th day of May 1965 SEAL) test:
EDWARD J. BRENNER RNEST W. SWIDER Commissioner of Patents testing Officer

Claims (1)

1. A PROCESS FOR RESTORING A PHOTOCONDUCTOR ELECTROLYTICALLY DEVELOPABLE SHEET MATERIAL HAVING ONLY LATENT CONDUCTIVITY IMAGES THEREON TO ITS DARK ADAPTED STATE AND FOR WASHING THE SURFACE THEREOF WHICH COMPRISES CONTACTING AN ORGANIC PHOTOCONDUCTOR BONDED TO AN ELECTRICALLY CONDUCTIVE CARRIER WITH LIQUID WATER HEATED TO AT LEAST 100*F. AND COOLING THE HEATED PHOTOCONDUCTOR TO AMBIENT TEMPERATURE.
US22670A 1960-04-18 1960-04-18 Image removal Expired - Lifetime US3154414A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
NL263727D NL263727A (en) 1960-04-18
US22670A US3154414A (en) 1960-04-18 1960-04-18 Image removal
ES0266306A ES266306A1 (en) 1960-04-18 1961-04-05 Image removal
GB12591/61A GB963433A (en) 1960-04-18 1961-04-07 Process for the restoration of photoconductive sheet
CH451961A CH399175A (en) 1960-04-18 1961-04-17 Process for making a latent image-containing photoconductive material recyclable for a new exposure
DEM48721A DE1263510B (en) 1960-04-18 1961-04-17 Process for removing conductive images from photoconductive layers
BE602731A BE602731A (en) 1960-04-18 1961-04-18 Image removal
FR859113A FR1286453A (en) 1960-04-18 1961-04-18 Method for removing latent images from a photoconductor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US22670A US3154414A (en) 1960-04-18 1960-04-18 Image removal

Publications (1)

Publication Number Publication Date
US3154414A true US3154414A (en) 1964-10-27

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Application Number Title Priority Date Filing Date
US22670A Expired - Lifetime US3154414A (en) 1960-04-18 1960-04-18 Image removal

Country Status (7)

Country Link
US (1) US3154414A (en)
BE (1) BE602731A (en)
CH (1) CH399175A (en)
DE (1) DE1263510B (en)
ES (1) ES266306A1 (en)
GB (1) GB963433A (en)
NL (1) NL263727A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5226225A (en) * 1975-08-22 1977-02-26 Ricoh Co Ltd Method for erasing durable photoconductivity memory of photosensitive material
JPS5433134B1 (en) * 1970-05-01 1979-10-18
JPS55577A (en) * 1979-04-14 1980-01-05 Canon Inc Image former
US20100139631A1 (en) * 2005-06-24 2010-06-10 Behr Gmbh & Co, Kg Heat exchanger

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1025985A (en) * 1973-07-31 1978-02-07 Rimily F. Avramenko Method for producing a visible image

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2286744A (en) * 1935-11-20 1942-06-16 Leatherman Martin Process of fireproofing
US2863767A (en) * 1955-01-17 1958-12-09 Haloid Xerox Inc Xerographic method
US2904431A (en) * 1954-08-26 1959-09-15 Rca Corp Electrographotographic charging means
GB820763A (en) * 1956-07-16 1959-09-23 Kodak Ltd Improvements in or relating to electrostatic printing
US2940847A (en) * 1957-07-03 1960-06-14 None i red
US2987660A (en) * 1955-06-06 1961-06-06 Haloid Xerox Inc Xerographic charging
US3010883A (en) * 1956-03-30 1961-11-28 Minnesota Mining & Mfg Electrolytic electrophotography

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2286744A (en) * 1935-11-20 1942-06-16 Leatherman Martin Process of fireproofing
US2904431A (en) * 1954-08-26 1959-09-15 Rca Corp Electrographotographic charging means
US2863767A (en) * 1955-01-17 1958-12-09 Haloid Xerox Inc Xerographic method
US2987660A (en) * 1955-06-06 1961-06-06 Haloid Xerox Inc Xerographic charging
US3010883A (en) * 1956-03-30 1961-11-28 Minnesota Mining & Mfg Electrolytic electrophotography
GB820763A (en) * 1956-07-16 1959-09-23 Kodak Ltd Improvements in or relating to electrostatic printing
US2940847A (en) * 1957-07-03 1960-06-14 None i red

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5433134B1 (en) * 1970-05-01 1979-10-18
JPS5226225A (en) * 1975-08-22 1977-02-26 Ricoh Co Ltd Method for erasing durable photoconductivity memory of photosensitive material
JPS5822745B2 (en) * 1975-08-22 1983-05-11 株式会社リコー It's important to know what's going on.
JPS55577A (en) * 1979-04-14 1980-01-05 Canon Inc Image former
JPS562341B2 (en) * 1979-04-14 1981-01-19
US20100139631A1 (en) * 2005-06-24 2010-06-10 Behr Gmbh & Co, Kg Heat exchanger

Also Published As

Publication number Publication date
BE602731A (en) 1961-10-18
NL263727A (en)
ES266306A1 (en) 1961-08-16
GB963433A (en) 1964-07-08
CH399175A (en) 1966-03-31
DE1263510B (en) 1968-03-14

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