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US3770484A
Expired / Lapsed
US
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Electrophotographic copying, printing or reproducing method
Assignee: Individual
•
Filing: 1971-06-28
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Granted: 1973-11-06
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Expires: 1991-06-28
Abstract
Abstract The invention relates to an electrostatic copying method by which non-conductive images on an original are reproduced. An image forming member is used of such resistivity and thickness that charge applied to one surface is retained thereon, but can be discharged through the thickness of the material when a discharge path is provided at the opposite surface. When such discharge path is provided and the image forming member is charged, the first surface thereof will be discharged in areas opposite the conductive path, but will retain its charge in other areas.
Inventors
- 👤 N Shreeve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:54
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
21 words
A method as claimed in claim 1 wherein said one surface of said image forming member is charged by corona discharge.
Claim 2
Dependent Claim
26 words
A method as claimed in claim 1 wherein a conductive backing plate is urged against the side of the original remote from the image forming member.
Claim 3
Dependent Claim
35 words
A method as claimed in claim 1 wherein the image forming member is made of one of the group comprising cellulose acetate, cellulose tri-acEtate and ethyl cellulose, and is between 0.001 and 0.005 inch thick.
Claim 4
Dependent Claim
42 words
A method as claimed in claim 1 wherein the image areas of the original are defined by recesses in the surface of the original which do not touch the image forming member when the image forming member is contacted with the original.
Claim 5
Dependent Claim
28 words
A method as claimed in claim 5 wherein the original is paper, and the recesses are impressions made with a typewriter, and are more than 0.002 mm deep.
Claim 6
Dependent Claim
23 words
A method as claimed in claim 1 wherein the image areas of the original are non-conductive areas of the surface of the original.
Claim 7
Dependent Claim
44 words
A method as claimed in claim 1 wherein the image areas of the original are defined by areas thereof surrounding raised representations on the original, which areas do not touch the image forming member when the image forming member is contacted with the original.
Claim 8
Dependent Claim
29 words
A method as claimed in claim 1 including the further step of locating a non-conductive liquid toner system at the side of the image forming member which is charged.
References Cited (Backward Citations)
US3145655A
Cited
US3585061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |