Patent US3615403A successfully refreshed from Google Patents.
US3615403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inorganic salt-resin conductive coatings for electrophotographic paper
Assignee: GAF Corp
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Filing: 1968-03-26
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Granted: 1971-10-26
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Expires: 1988-03-26
Abstract
Abstract Electrophotographic paper, having thereon conductive coatings applied from an aqueous coating composition containing an Nvinylpyrrolidone polymer, polyvinyl acetate emulsion and an inorganic salt-polyhydric alcohol system.
Inventors
- 👤 James K J Cheng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:35
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/10; G03G5/101
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
Electrophotographic recording material as defined in claim 1 wherein the inorganic salt is sodium chloride and the polyhydric alcohol is glycerol.
Claim 2
Dependent Claim
22 words
Electrophotographic recording material as defined in claim 1 wherein the inorganic salt is sodium chloride and the polyhydric alcohol is ethylene glycol.
Claim 3
Dependent Claim
21 words
Electrophotographic recording material as defined in claim 1 wherein the inorganic salt is ammonium chloride and the polyhydric alcohol is glycerol.
Claim 4
Dependent Claim
37 words
Electrophotographic recording material as defined in claim 1 wherein the N-vinylpyrrolidone polymer is a copolymer of N-vinylpyrrolidone and vinyl acetate in which the proportion of N-vinylpyrrolidone in the copolymer is from 10 to 25 percent by weight.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |