US3554741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric photoconductors of n-vinylindole and their use in electrophotographic processes
Assignee: International Business Machines Corp
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Filing: 1968-04-08
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Granted: 1971-01-12
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Expires: 1988-04-08
Abstract
Abstract POLYMERIC PHOTOCONDUCTORS OF N-VINYLINDOLE, BOTH UNSUBSTITUTED AND SUBSTITUTED, COPOLYMERIZED THROUGH ITS VINYL SUBSTITUENT WITH A COREPEATING UNIT HAVING THE STRUCTURAL FORMULA: -C<(-C(-)-R''-) WHEREIN R'' IS A FUSED RING RADICAL. EXAMPLES OF THESE COPOLYMERS ARE N-VINYLINDOLE-INDOLE COPOLYMER, N-VINYLINDOLE N-METHYLINDOLE COPOLYMER, N-VINYLINDOLE-INDENE COPOLYMER, N-VINYLLINDOLE-COUMARIN COPOLYMER, AND NVINYLINDOLE-MALEIC ANHYDRIDE COPOLYMER.
Inventors
- 👤 Edward Gipstein
- 👤 William A Hewett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:05
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/071; C; C08; C08F; C08F24/00; C08F26/00; C08F26/06; C08F28/00; C08F28/06
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |