US3697264A
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Novel photoconductive carbazole polymers and photoconductive elements embodying same
Assignee: RICHARD M PODHAJNY
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Filing: 1970-03-02
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Granted: 1972-10-10
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Expires: 1990-03-02
Abstract
Abstract THIS INVENTION IS ADDRESSED TO NOVEL SUBSTITUTED N-VINYL CARBAZOLE POLYMERS AND COPOLYMERS AND TO THE PREPARATION OF AN ELECTROPHOTOGRAPHIC ELEMENT HAVING A PHOTO CONDUCTIVE LAYER FORMULATED OF SAME.
Inventors
- 👤 Richard M Podhajny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:32
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/071; G03G5/072; G03G5/073; C; C08; C08F; C08F8/00
Claims Analysis
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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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |