Patent US4302189A successfully refreshed from Google Patents.
Patent US3634079A successfully refreshed from Google Patents.
US3634079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substrate layer for dichroic photoconductors
Assignee: International Business Machines Corp
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Filing: 1969-12-22
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Granted: 1972-01-11
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Expires: 1989-12-22
Abstract
Abstract In an electrophotographic plate suitable for use in dichroic contact reflex reproduction a novel substrate layer of polyamide is inserted between the dichroic sensitizer and the conductive base.
Inventors
- 👤 Robert Bruce Champ
- 👤 Meredith David Shattuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:44
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/043; G03G5/14; G03G5/142
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
20 words
An electrophotographic plate as claimed in claim 1 wherein the polyamide has a resistivity of less than 1014 ohm cm.
Claim 2
Dependent Claim
20 words
An electrophotographic plate as claimed in claim 1 wherein the polyamide has a resistivity of less than 1010 ohm cm.
Claim 3
Dependent Claim
20 words
An electrophotographic plate as claimed in claim 1 wherein the polyamide layer has a thickness of less than 5 microns.
Claim 4
Dependent Claim
20 words
An electrophotographic plate as claimed in claim 1 wherein the polyamide layer has a thickness of less than 2 microns.
Claim 5
Dependent Claim
15 words
An electrophotographic plate as claimed in claim 1 wherein the charge transport layer is polyvinylcarbazole.
Claim 6
Dependent Claim
17 words
An electrophotographic plate as claimed in claim 1 wherein the polyamide layer contains an electron acceptor sensitizer.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |