Patent US3740219A successfully refreshed from Google Patents.
US3740219A
Expired / Lapsed
US
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Photoconductive isocyanate reaction products and deposited layers
Assignee: Renker dt GmbH
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Filing: 1970-10-26
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Granted: 1973-06-19
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Expires: 1990-10-26
Abstract
Abstract PHOTOCONDUCTIVE SENSITIZED AND UNSENSITIZED LAYERS FOR USE WITH ELECTRO-PHOTOGRAPHIC RECORDING MATERIALS, ARE FORMED BY THE PHOTOCONDUCTIVE REACTION PRODUCTS OF AT LEAST ONE AROMATIC OR HETEROCYCLIC ORGANIC NITROGEN COMPOUND WHICH IS SUBSTANTIALLY NONPHOTOCONDUCTIVE WITH AT LEAST ONE ORGANIC COMPOUND CONTAINING AT LEAST ONE ISOCYANATE GROUP, TO PROVIDE A SELF-ADHERING PHOTOCONDUCTOR WHICH MAY ADDITIONALLY INCLUDE A KNOWN PHOTOCONDUCTIVE MATERIAL.
Inventors
- 👤 H Kosche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:04
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/075; G03G5/076; G03G5/0763; G03G5/0765
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |