US3732180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductive composition and method
Assignee: Eastman Kodak Co
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Filing: 1971-12-27
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Granted: 1973-05-08
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Expires: 1991-12-27
Abstract
Abstract A METHOD IS PROVIDED FOR FORMING A CO-CRYSTALLINE COMPLEX OF PYRYLIUM DYE AND POLYMER WHICH INVOLVES DISSOLVING THE COMPONENTS IN A SOLVENT SYSTEM IN WHICH THE SOLUBILITIES OF THE COMPONENTS ARE UBSTANTIALLY EQUAL. A NONPOLAR PRECIPITATING LIQUID IN WHICH THE COMPONENTS ARE INSOLUBLE IS COMBINED WITH A SOLUTION ABOVE TO PRODUCE PRECIPITATION OF THE COMPLEX WHICH IS THEN REMOVED FROM THE VARIOUS LIQUIDS. THE RESULTANT COMPLEX IS PHOTOCONDUCTIVE AND CAN BE USED TO SENSITIZE OTHER PHOTOCONDUCTORS. ELECTROPHOTOGRAPHIC ELEMENTS ARE PREPARED BY DISPRSING THE SO-FORMED COMPLEX IN A POLYMERIC VEHICLE AND COATING THE DISPERSION ON A SUPPORT.
Inventors
- 👤 E Gramza
- 👤 D Schreiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:46
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0622; G03G5/0624; G03G5/0635; G03G5/0637; 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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |