Patent US1825433A successfully refreshed from Google Patents.
US3671233A
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Photoconductive elements containing alkali-release materials
Assignee: Eastman Kodak Co
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Filing: 1969-09-02
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Granted: 1972-06-20
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Expires: 1989-09-02
Abstract
Abstract ELECTROPHOTOGRAPHIC ELEMENTS CONTAINING ALKALI-RELEASE MATERIALS ADMIXED WITH PHOTOCONDUCTIVE COMPOSITIONS ARE DESCRIBED. WHEN THESE ELEMENTS ARE DEVELOPED AND HEATED, THE ALKALI-RELEASE MATERIALS GENERATE ALKALINE PRODUCTS WHICH CAUSE A SHIFT IN THE ABSORPTION OF THE SENSITIZERS CONTAINED IN THE PHOTOCONDUCTIVE COMPOSITIONS. SUCH A SHIFT GENERALLY REDUCES THE OPTICAL OPACITY OF THE ELEMENTS, THUS PERMITTING THE ELEMENTS O BE USED AS MASTERS FROM WHICH FURTHER REPRINTS CAN BE MADE.
Inventors
- 👤 Lawrence E Contois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:16
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0503; G03G5/051; G03G5/0517; G03G5/0514; G03G5/09; G03G8/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |