Patent US3689769A successfully refreshed from Google Patents.
US3689769A
Expired / Lapsed
US
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Electrophotographic copy process and element produced in same
Assignee: ALEXANDER U AVERBACH
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Filing: 1969-11-17
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Granted: 1972-09-05
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Expires: 1989-11-17
Abstract
Abstract An electrostatic copy process in which the electrostatic charge is applied to a film of a polyester resin and in which charge differential for development of a latent electrostatic image is achieved by exposure to intense ultraviolet radiations.
Inventors
- 👤 Alexander U Averbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:52
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/04; G03F; G03F7/00; G03F7/004; G03F7/039; G03G5/00; G03G5/02; G03G5/026
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
20 words
The process as claimed in claim 1 in which the ultra-violet radiations are within the range of 3000- 4000 A.U.
Claim 2
Dependent Claim
20 words
The process as claimed in claim 1 in which the ultra-violet radiations are within the range of 3600- 3700 A.U.
Claim 3
Dependent Claim
23 words
The process as claimed in claim 1 in which the radiations striking the charged surface are within the range of 400- 1400 microjoules/cm2.
Claim 4
Dependent Claim
22 words
The process as claimed in claim 1 in which the film has a thickness within the range of 0.25 to 2 mils.
Claim 5
Dependent Claim
58 words
The process as claimed in claim 1 in which the film is given an overall electrostatic charge in excess of 1000 volts and which only a portion of the charge is removed from exposed areas to provide a reduction of at least 10 percent in the voltage between the exposed portions and the unexposed latest electrostatic imaged portion.
Claim 6
Dependent Claim
48 words
The process as claimed in claim 1 in which the exposure of the charged surface to the ultra-violet pattern comprises positioning a transparency containing the image adjacent the charged surface of the film and directing radiations rich in ultra-violet through the transparency onto the surface of the film.
Claim 7
Dependent Claim
22 words
The process as clAimed in claim 7 in which the exposure to ultra-violet is for a period of from 1- 30 seconds.
Claim 8
Dependent Claim
23 words
The process as claimed in claim 1 which includes the step of fixing the toner particles on the imaged surface of the film.
Claim 9
Dependent Claim
26 words
The process as claimed in claim 1 in which the film is a polyester film having a metallized layer on the surface opposite the charged surface.
Claim 10
Dependent Claim
166 words
A developed film consisting essentially of a plastic material selected from the group consisting of a polyester containing an aromatic group and a polyimide having high dielectric and electrical insulating properties with or without a conductive coating on the back side of the film and in which the film is capable of dissipating at least a portion of the electrostatic charge in response to exposure to intense ultra-violet radiation in the exposed portions of the film corresponding to the imaged portion of an original prepared by the process of claim 1 in which the differential between the exposed portions and the unexposed portions of the film is more than 10 percent when the absolute voltage in the unexposed portions is in excess of 1000 volts, in which the differential is in excess of 50 percent when the absolute voltage is less than 1000 but more than 500 volts and in which the differential is almost 100 percent when the absolute voltage is less than 500 volts.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |