Patent US3578449A successfully refreshed from Google Patents.
US3578449A
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US
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Transfer image process utilizing an organic phosphine as silver halide solvent
Assignee: Polaroid Corp
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Filing: 1968-01-22
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Granted: 1971-05-11
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Expires: 1988-01-22
Abstract
Abstract ORGANIC DERIVATIVES OF THE TRIHYDRIDES OF TRIVALENT ELEMENTS IN GROUP V-A OF THE PERIODIC TABLE HAVING AN ATOMIC NUMBER GREATER THAN 7 AND LESS THAN 83 ARE USED AS SILVER HALIDE SOLVENTS IN PHOTOGRAPHIC PROCESSING COMPOSITIONS. SPECIFICALLY, ORGANIC PHOSPHINES, ARSINES, STIBINES AND MIXTURES THEREOF ARE USED IN PHOTOGRAPHIC PROCESSING COMPOSITIONS WHICH FIND PARTICULAR UTILITY IN SILVER DIFFUSION TRANSFER TECHNIQUES.
Inventors
- 👤 Stanley M Bloom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:50
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/32; G03C8/36; G03C8/365; G03C8/02; G03C8/04; G03C8/06
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |