EP0108557A2 - Hot mill hydraulic direct roll drive - Google Patents
Hot mill hydraulic direct roll drive Download PDFInfo
- Publication number
- EP0108557A2 EP0108557A2 EP83306522A EP83306522A EP0108557A2 EP 0108557 A2 EP0108557 A2 EP 0108557A2 EP 83306522 A EP83306522 A EP 83306522A EP 83306522 A EP83306522 A EP 83306522A EP 0108557 A2 EP0108557 A2 EP 0108557A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolls
- roll
- mill
- strip
- motors
- 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.)
- Withdrawn
Links
- 230000009467 reduction Effects 0.000 claims description 14
- 230000008878 coupling Effects 0.000 claims description 13
- 238000010168 coupling process Methods 0.000 claims description 13
- 238000005859 coupling reaction Methods 0.000 claims description 13
- 238000005098 hot rolling Methods 0.000 claims description 7
- 230000013011 mating Effects 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 abstract description 17
- 238000000926 separation method Methods 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 229910000881 Cu alloy Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B2003/005—Copper or its alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
- B21B2035/005—Hydraulic drive motors
Definitions
- a drive system is particularly adapted to use in conjunction with a hot .rolling mill that receives continuously cast, hot metallic strand, particularly strands of copper and copper alloys, and produces a high quality narrow strip with precisely controlled dimensions, profile and camber and with a high reduction.
- the mill has only two working rolls with a comparatively small diameter, each mounted for rotation in chock blocks. One roll is fixed and the other roll and its chock blocks are movable vertically under the control of a pair of hydraulic cylinders to vary the gap between the rolls.
- this mill can produce a bite in excess of 2.54 cm (one inch) and approaching 5.1 cm (two inches) and bite ratios of as low as 5:1 without slippage.
- each roll 42 is driven independently by one of the hydraulic motors 46. There is therefore no gearing or other power transmission coupling which is usually employed to transmit power from one driven roll to another slave roll or rolls.
- the motors are coupled directly to the rolls through the spline coupling assembly 80 including a "roll half" 80a found integrally with one end of each roll and mating "motor half” 80b mounted on the drive shaft 46a of the motor.
- the coupling halves 80a and 80b are simply mated and bolted to one another. This coupling avoids transmission power losses and greatly reduces the bulk, complexity and cost of the roll drive. It also allows rolls to be changed easily.
Abstract
A rolling mill capable of forming a hot, continuously cast metallic strand into a strip with a large bite and with one pass uses only two small diameter rolls, each mounted for rotation in a pair of chock blocks and each having a comparatively narrow, enlarged diameter working portion. An hydraulic motor that produces a large torque at a low rotational speed with good control rotates each roll. The motors are coupled to their associated rolls directly.
Description
- This invention relates in general to a rolling mill for strand and strip metal products. More specifically, it relates to a hydraulic drive system for the rolls of a two high, small roll diameter mill where the drive system provides a high torque at a low speed to produce a large reduction without slippage.
- A wide variety of mill stands are known for hot and cold rolling metals. Where there is a large separating force between the working rolls, whether due to a large reduction and/or to the nature of the material being rolled, there are a number of inherent design problems. One is that the rolls work against a separation force that is sufficiently large to bend or even to deform the rolls depending on the diameter, length and material of the roll as well as the nature of the material, its temperature, and the reduction ratio. The diameter of the roll is also important because for a given "bite" (thickness reduction of the product entering the mill) the "bite ratio" (roll diameter over bite) is an important factor in determining when slippage will occur between the rolls and the product. As low a ratio as possible is desired to minimize roll size (and therefore roll cost) and/or maximize bite. Typical bite ratios for mills currently in use are in the range of 50:1 to 100:1. Another consideration is that larger diameter rolls produce a greater speed, however, the attendant separation force is also larger. Ideally, the roll design should produce the desired spread with the minimal separation force. Heretofore, in order to deal with large separation forces (e.g., in excess of 45,359 kg/stand (100,000 lbs/stand), it has been necessary to use a four high mill, that is, one with two working rolls and two "back up" rolls that provide mechanical support for the working rolls. Such mills are also characterised by a quite heavy, expensive frame that can accommodate all four rolls and resist the large forces generated by the rolling. U.S.-A-3,103,138; U.S.-A-3,391,557; U.S.-A-3,550,413 and U.S.-A-3,568,484 are exemplary of such four high mill stands. While certain mills produce a high reduction by passing the product through the mill multiple times, this is not possible in a continuous, on-line casting and rolling operation. (For example, rolling operations with twenty passes are not uncommon).
- The torque and speed of rotation of the rolls are important in producing a high reduction without slippage. More specifically, in order to hot roll copper and brass strand with a large bite (e.g., in excess of 2.54 cms (1 inch) and a low bite ratio (e.g., 7:1), the drive system for the working rolls must have a comparatively high torque (typically in excess of 1356 Nm (1,000 ft-lbs.) to achieve a large bite and a comparatively low speed (typically less than 400 rpm) to couple the rolling mill speed to that of the caster. In addition, it is necessary to vary these parameters depending on the particular product being run and other factors such as the roll diameter. Heretofore mill stands requiring a variable high torque at a low speed have used electric motors with a reducing gear train. This arrangement provides the required operating characteristics, but it is a costly system that takes up a large amount of space compared to the mill itself. Moreover, applicant is not aware of any commercially available direct drive trains for rolling mills that can produce thousands of Nm (ft-lbs) of torque. Further, known drive trains with many components are not "stiff". As a result, the drive system is not closely responsive to servo changes in the drive input. Indeed no known rolling mill is designed to utilise a highly responsive direct drive. The drive train of the present system is a directly coupled hydrostatic drive commonly used in large earth moving equipment.
- Torque requirements are also interrelated with other design factors such as roll diameter and anticipated separation forces and thus, size and cost of the mill, the gauge of the rolled product and friction. Heretofore, the lower rolling force of small diameter rolls and their ability to roll thin gauge products has generally been balanced against offsetting considerations through the .use of back-up rolls. If two rolls are used where substantial separation forces are produced, prior art mills have used costly, massive rolls with very large diameters, e.g., 61 to 91 cm (two to three feet). Heretofore, high reduction rolling using unsupported (two high) small diameter rolls (less than at least 30.5 cm (one foot) in diameter) has not been commercially practical. U.S.-A-4,218,907 describes a two high mill which provides operating characteristics only achievable previously with four high mills. However, this two high mill requires a special bearing assembly which supports the rolls over all or most of their length.
- It is therefore a principal object of this invention to provide a drive for the working rolls of a rolling mill that produces a high quality narrow strip from a continuously cast hot metallic strand where the mill is only two high and uses small diameter rolls yet is capable of producing a high reduction with precisely controlled dimensions and profile of the rolled strip product. Another significant object of the invention is to provide such a drive characterised by a variable high torque, low speed drive for the rolls that does not require an electric motor or reducing gears.
- Yet another object of the invention is to provide a drive that is compact and relatively cost effective as compared to known electric drives.
- Still another object of the invention is to provide a drive that is readily engaged to or disengaged from the working rolls to facilitate roll changes.
- A drive system according to the present invention is particularly adapted to use in conjunction with a hot .rolling mill that receives continuously cast, hot metallic strand, particularly strands of copper and copper alloys, and produces a high quality narrow strip with precisely controlled dimensions, profile and camber and with a high reduction. The mill has only two working rolls with a comparatively small diameter, each mounted for rotation in chock blocks. One roll is fixed and the other roll and its chock blocks are movable vertically under the control of a pair of hydraulic cylinders to vary the gap between the rolls. For copper and brass, this mill can produce a bite in excess of 2.54 cm (one inch) and approaching 5.1 cm (two inches) and bite ratios of as low as 5:1 without slippage.
- Each roll is driven independently by an hydraulic motor that can develop a large variable torque at a low rotational speed. There is a direct coupling between the motor and the roll. The rolls and the motor preferably have mating couplings that bolt to one another. The motors are preferably of the radial piston type with a swashplate in the pump power supply to adjust the speed. In the preferred form, the rolls also propel the strand or strip.
- An embodiment of the invention will now be described by way of example, reference being made to the accompanying drawings, in which:-
- Fig. 1 is a highly simplified top plan view of a tandem hot rolling mill operation according to the present invention;
- Fig. 2 is a more detailed top plan view, with portion broken away, of the three mill stands shown in Fig. 1;
- Fig. 3 is a view in side elevation of the mill stands shown in Fig. 2;
- Fig. 4 is a top plan view of the first mill stand shown in Figs. 1-3 with frame portions, rotary brushes, entrance and exit guides, and gauges removed for clarity;
- Fig. 5 is a view in front elevation of the mill stand shown in Fig. 4;
- Fig. 6 is a detailed view in front elevation of the rolls and their associated chock blocks shown in Figs. 4 and 5 with the right lower chock block shown in vertical section;
- Fig. 7 is a view in side elevation of the chock blocks shown in Fig. 6; and
- Fig. 8 is a highly simplified view in side elevation showing the action of the rolls of the first mill stand to effect a very high reduction of an incoming cast rod into a narrow strip.
- Fig. 1 shows a tandem hot
rolling line 12 that receives a continuously cast metallic strand 14 and reduces it to anarrow strip 16 of accurately controlled width and gauge. While this line can hot roll a wide variety of metals and strands having a variety of cross-sectional shapes, it will be described herein with respect to its preferred use, the continuous hot rolling of copper and copper alloy rod having a circular cross section into a narrow strip. This rod is preferably supplied directly from a continuous casting operation of the type described in U.S.-A-4,211,270 and U.S.-A-4,301,857, the disclosures of which are incorporated herein by reference. This rod leaves the caster red hot and advancing at speeds that are usually in the range of 76.2 to 762 cm/min (cpm) (30 to 300 inches per minute (ipm)) depending on the diameter of the rod being cast and the desired production line speed. - The
line 12 includes first, second and third hot rolling mill stands 18, 20 and 22, respectively. Each stand is preceded by a gas-firedreheating furnace 24 that raises the temperature of the strand 14 orstrip 16 to the desired rolling temperature, typically 760°C (1400°F). The separation between adjacent mill stands is sufficiently short that the strip will not cool substantially (or require excessively long reheating furnaces), but long enough that the speed and gap controls on each stand are able to adjust without adversely affecting the strip, e.g., causing unstable plastic flow. After the strip leaves thethird stand 22 it is cooled in a closely coupledquench tank 26 to control oxidation. A gauge area including alaser width gauge 28 and anX-ray thickness gauge 30 follow the quench tank. Each of these instruments generates a measurement signal that is used to control the operation of theline 12.Width gauges 28 are also mounted at the exit of the last mill stand to provide an immediate measure of the width of thestrip 16 as it leaves the mill. Each mill also preferably has a two- colour infrared pyrometer (not shown) mounted to measure the temperature of the strip as it enters the mill. The line terminates with ashear 36 and aspooler 38. The shear is used primarily to remove portions of strip that do not meet set tolerances, for example, the initial portion of a strip when the line starts up before the rolls have fully adjusted to a steady state operating condition. Thespooler 38 collects thestrip 16 in an even, level wound coil on a core. - With particular reference to Figs. 2-5, each rolling
mill stand strip 16. Two rolls 42,42 are each mounted in associated chock blocks 44,44 for rotation. Anhydraulic motor 46 that receives a supply of pressurized hydraulic fluid from anhydraulic power supply 47 drives each of therolls Hydraulic cylinders rods cylinders 48 are capable of operating with applied fluid pressures of 246 kg/cm2 (3,500 psi) to generate downward forces of 31752 kg (70,000 lbs) per cylinder or 63500 kg (140,000 lbs.) per stand. The cylinders also preferably include a standard, commercial distance measuring device which can measure vertical movement of therods 48a. An internal ultrasonic device with a resolution of 0.00254 mm (0.0001 inch) is preferred. Thecylinders strip 16. - The frame has a
base member 40a formed of a pair ofbeams 40 a(1) aligned generally parallel to the strip and a pair ofcross beams 40a(2) aligned generally transverse to the strip. Thebeams 40a(1) are located generally under thehydraulic motors beams 40a(2) support the overlying components of the mill, but are spaced to allow clearance for the rolls and their mountings. The cross beams 40a(2) support a movablemotor mounting plate 50 and a fixedmotor mounting plate 52. Themovable plate 50 is supported on apneumatic cylinder 54 that counterbalances the motor so that there are approximately equal loads on thecylinders brackets plate 50. Each of these brackets supports a vertically orientedslide shaft 60 journalled in an associatedpillow block 62 which in turn is mounted on a vertical side frame member 40b. The slide shafts guide the vertical movement of the upper motor. Since themotor mounting plate 52 is fixed to thebeams 40a(2),40a(2), the associatedhydraulic motor 46 mounted on its outer face and thelower roll 42 driven by this motor do not move vertically during operation (except for a very small deflection due to the separation forces). Aspline coupling 80 between themotor 46 and its associatedroll 42 is designed to accommodate this deflection. - With reference principally to Fig. 6, the
rolls 42 of the present invention are characterised by a relatively narrow central workingportion 42a having an enlarged diameter as compared toneck portions assemblies 70 mounted in eachchock block 44. However, the diameter of even this "enlarged" workingportion 42a is small, less than 30.5 cm (a foot) and typically 12.7 to 17.8 cm (five to seven inches), as compared to conventional two high rolls used in "break down" mills where there is a substantial reduction in the thickness of the product being rolled and there are large separation forces. - A significant feature of the present invention is that each
roll 42 is driven independently by one of thehydraulic motors 46. There is therefore no gearing or other power transmission coupling which is usually employed to transmit power from one driven roll to another slave roll or rolls. Another feature is that the motors are coupled directly to the rolls through thespline coupling assembly 80 including a "roll half" 80a found integrally with one end of each roll and mating "motor half" 80b mounted on the drive shaft 46a of the motor. To connect the motor to the roll, the coupling halves 80a and 80b are simply mated and bolted to one another. This coupling avoids transmission power losses and greatly reduces the bulk, complexity and cost of the roll drive. It also allows rolls to be changed easily. Using this direct drive, the "stiffness" of the drive train is substantially increased. This makes bothrolls rolls - This coupling is possible due to the use of hydraulic motors that provide a high torque (in excess of 1356 Nm (1,000 ft.-lbs.)) at a low rpm (less than 400, and often less than 100). The
hydraulic motors hydraulic power supply 47. With this arrangement, the pressure across the motor can be varied to maintain the rolled strip at a constant speed. This drive system provides a precise and responsive control over the power supplied to therolls first mill stand 18, themotors second stand 20 preferably utilises motors 46',46' of the same type as themotors motors 46",46" of the third mill stand preferably have a required total output torque of 3390 Nm (2,500 ft-lbs) (3525 Nm (2,600 ft-lbs,) peak). - In operation the
line 12 continuously hot rolls a metallic strand 14 into a strip 16 (Fig. 8) having a highly uniform configuration and a recrystallised grain pattern. The line preferably operates to roll copper or copper alloy rod into narrow strips. In addition to rolling the strand or strip, each mill, and in particular thefirst mill 18, act as drives for the strand or strip. - There has been described a novel drive system particularly useful in a two high hot rolling mill with small diameter rolls that can produce a narrow strip of copper or copper alloys from a continuously cast strand. The rolling is characterised by a large bite with only one pass in each mill stand. The drive system, utilising hydraulic motors coupled directly to the associated rolls, produces a high torque at a low rotational speed and with good control. Also, this drive system is compact, less costly than conventional electric motor drives and facilitates the rapid disengagement of the rolls from the drive to facilitate their replacement.
- While the invention has been described with reference to its preferred embodiment, it will be understood that various variations and modifications will occur to those skilled in the art from the foregoing detailed description and the accompanying drawings. Such variations and modifications are intended to fall within the scope of the appended claims.
Claims (4)
1. In a hot rolling mill that includes a frame, a pair of small diameter rolls rotatably mounted in the frame, and means urging the rolls toward one another to produce a large reduction of a metallic strand into a narrow strip, the improvement comprising drive means for rotating said rolls about their longitudinal axes comprising
an hydraulic motor associated with each of said rolls that produces a high torque output at a controlled uniform speed, and
means for directly coupling said hydraulic motors with the associated one of said rolls.
2. Improved drive means according to claim 1 characterised in that said hydraulic motors are radial piston motors and include an hydraulic power supply with an adjustable swashplate to control said rotation.
3. Improved drive means according to claim 1 or 2 characterised in that said high torque is in excess of 1356 Nm (1,000 ft/lbs) and said controlled uniform speed is less than 400 rpm.
4. Improved drive means according to claim 1, 2 or 3 characterised in that said direct coupling means comprises a coupling secured to each said drive shaft,
a mating coupling secured to one end of each said roll, and
means for securing said couplings in said mating relationship.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US43673382A | 1982-10-26 | 1982-10-26 | |
US436733 | 1982-10-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0108557A2 true EP0108557A2 (en) | 1984-05-16 |
EP0108557A3 EP0108557A3 (en) | 1986-01-15 |
Family
ID=23733603
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83306522A Withdrawn EP0108557A3 (en) | 1982-10-26 | 1983-10-26 | Hot mill hydraulic direct roll drive |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0108557A3 (en) |
JP (1) | JPS5994512A (en) |
AU (1) | AU2053483A (en) |
BR (1) | BR8305846A (en) |
DK (1) | DK490083A (en) |
ES (1) | ES8406239A1 (en) |
FI (1) | FI833439A (en) |
IN (1) | IN158892B (en) |
ZA (1) | ZA837038B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0207053A2 (en) * | 1985-06-11 | 1986-12-30 | VOEST-ALPINE Aktiengesellschaft | Process and device for the drive control of rotary machine parts, such as the rolls of a continuous-rolling mill |
EP1454684A2 (en) | 2003-03-04 | 2004-09-08 | LANGENSTEIN & SCHEMANN GMBH | Method for forming a workpiece and rolling machine |
EP2340898A3 (en) * | 2003-03-04 | 2013-11-27 | Langenstein & Schemann Gmbh | Rolling machine |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2163862A1 (en) * | 1971-12-22 | 1973-06-28 | Helmut H Mueller | Two high reversing mill - with hydraulic motor drive |
-
1983
- 1983-09-22 ZA ZA837038A patent/ZA837038B/en unknown
- 1983-09-26 FI FI833439A patent/FI833439A/en not_active Application Discontinuation
- 1983-10-05 IN IN1231/CAL/83A patent/IN158892B/en unknown
- 1983-10-21 JP JP58196252A patent/JPS5994512A/en active Pending
- 1983-10-24 BR BR8305846A patent/BR8305846A/en unknown
- 1983-10-25 AU AU20534/83A patent/AU2053483A/en not_active Abandoned
- 1983-10-25 ES ES526752A patent/ES8406239A1/en not_active Expired
- 1983-10-25 DK DK490083A patent/DK490083A/en not_active Application Discontinuation
- 1983-10-26 EP EP83306522A patent/EP0108557A3/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2163862A1 (en) * | 1971-12-22 | 1973-06-28 | Helmut H Mueller | Two high reversing mill - with hydraulic motor drive |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0207053A2 (en) * | 1985-06-11 | 1986-12-30 | VOEST-ALPINE Aktiengesellschaft | Process and device for the drive control of rotary machine parts, such as the rolls of a continuous-rolling mill |
AT383059B (en) * | 1985-06-11 | 1987-05-11 | Voest Alpine Ag | METHOD AND DEVICE FOR REGULATING THE DRIVE OF ROTATING MACHINE PARTS, ESPECIALLY THE ROLLS OF ROLLING MILLS |
EP0207053A3 (en) * | 1985-06-11 | 1989-04-26 | VOEST-ALPINE Aktiengesellschaft | Process and device for the drive control of rotary machine parts, such as the rolls of a continuous-rolling mill |
EP1454684A2 (en) | 2003-03-04 | 2004-09-08 | LANGENSTEIN & SCHEMANN GMBH | Method for forming a workpiece and rolling machine |
EP2340898A3 (en) * | 2003-03-04 | 2013-11-27 | Langenstein & Schemann Gmbh | Rolling machine |
Also Published As
Publication number | Publication date |
---|---|
DK490083D0 (en) | 1983-10-25 |
FI833439A (en) | 1984-04-27 |
ZA837038B (en) | 1984-06-27 |
JPS5994512A (en) | 1984-05-31 |
ES526752A0 (en) | 1984-08-01 |
BR8305846A (en) | 1984-05-29 |
IN158892B (en) | 1987-02-14 |
EP0108557A3 (en) | 1986-01-15 |
AU2053483A (en) | 1984-05-03 |
ES8406239A1 (en) | 1984-08-01 |
DK490083A (en) | 1984-04-27 |
FI833439A0 (en) | 1983-09-26 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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AK | Designated contracting states |
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17P | Request for examination filed |
Effective date: 19860628 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
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18W | Application withdrawn |
Withdrawal date: 19861206 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SHINOPULOS, GEORGE |