US3597195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydantoin-formaldehyde as binder material for photoconductive substances
Assignee: Agfa Gevaert NV
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Filing: 1968-02-27
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Granted: 1971-08-03
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Expires: 1988-02-27
Abstract
Abstract ELECTRO-PHOTOGRAPHIC RECORDING MATERIAL WHEREIN THE PHOTOCONDUCTIVE SUBSTANCE, PREFERABLY PHOTOCONDUCTIVE ZINC OXIDE, IS DISPERSED IN A BINDER CONTAINING AT LEAST 60% BY WEIGHT OF A HYDANTOIN-FORMALDEHYDE CONDENSATION POLYMER AND CHARACTERIZED BY RAPID REGAIN OF ITS DARK-RESISTIVITY SO AS TO BE SPECIALLY ADAPTED FOR RAPID REPETITIVE CHARGING AND EXPOSURE.
Inventors
- 👤 Karel Eugeen Verhille
- 👤 Luciaan Frans Voet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:28
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0557; G03G5/0575
Claims Analysis
Total Claims: 0
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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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |