US3975635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xeroradiographic plate
Assignee: Xerox Corp
•
Filing: 1975-01-24
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Granted: 1976-08-17
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Expires: 1995-01-24
Abstract
Abstract An improved xeroradiographic plate has a conductive backing member, an overlying layer of selenium and an intermediate layer of polyvinyl carbazole or an alloy of arsenic and selenium.
Inventors
- 👤 John H. Lennon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:09
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/043; G03G5/0433; G03G5/0436
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
A xeroradiographic plate consisting essentially of a conductive backing having thereon a photoconductive layer of selenium and an intermediate layer selected from the group consisting of polyvinyl carbazole and an alloy of from about 15 to about 45% by weight of arsenic and from about 55 to about 85% by weight of selenium.
Claim 2
Dependent Claim
53 words
A xeroradiographic plate consisting essentially of a conductive backing having thereon a photoconductive layer of selenium and an intermediate layer selected from the group consisting of polyvinyl carbazole and an alloy of from about 15 to about 45% by weight of arsenic and from about 55 to about 85% by weight of selenium.
Claim 3
Dependent Claim
20 words
The plate of claim 1 wherein the thickness of the selenium layer is from about 120 to about 400 microns.
Claim 4
Dependent Claim
20 words
The plate of claim 2 wherein the thickness of the intermediate layer is from about 15 to about 150 microns.
Claim 5
Dependent Claim
12 words
The plate of claim 3 wherein the intermediate layer is polyvinyl carbazole.
Claim 6
Independent Claim
69 words
A method of improving the resolution of an image pattern on an electrostatically charged surface consisting essentially of selenium overlying a conductive backing member which comprises interposing a layer selected from the group consisting of polyvinyl carbazole and an alloy of from about 15 to about 45% by weight of arsenic and from about 55 to about 85% by weight of selenium between the backing member and said surface.
Claim 7
Independent Claim
69 words
A method of improving the resolution of an image pattern on an electrostatically charged surface consisting essentially of selenium overlying a conductive backing member which comprises interposing a layer selected from the group consisting of polyvinyl carbazole and an alloy of from about 15 to about 45% by weight of arsenic and from about 55 to about 85% by weight of selenium between the backing member and said surface.
Claim 8
Independent Claim
93 words
A method of forming a radiograhic latent image pattern of electrostatic charges on a plate comprising placing a uniform electrostatic charge on the surface of a selenium layer overlying a conductive backing member and an intermediate layer selected from the group consisting of polyvinyl carbazole and an alloy of from about 15 to about 45% by weight of arsenic and from about 55 to about 85% by weight of selenium, supporting an object to be radiographed between the plate and a source of X-rays and exposing the plate to a source of X-rays.
Claim 9
Independent Claim
93 words
A method of forming a radiograhic latent image pattern of electrostatic charges on a plate comprising placing a uniform electrostatic charge on the surface of a selenium layer overlying a conductive backing member and an intermediate layer selected from the group consisting of polyvinyl carbazole and an alloy of from about 15 to about 45% by weight of arsenic and from about 55 to about 85% by weight of selenium, supporting an object to be radiographed between the plate and a source of X-rays and exposing the plate to a source of X-rays.
References Cited (Backward Citations)
US3484237A
Cited
US3712810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |