Patent US3594169A successfully refreshed from Google Patents.
US3594169A
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Tertiary aliphatic phosphines as photographic silver halide solvents
Assignee: Polaroid Corp
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Filing: 1969-01-21
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Granted: 1971-07-20
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Expires: 1989-01-21
Abstract
Abstract WATER-SOLUBLE TERTIARY ALIPHATIC PHOSPHINES ARE USED AS SILVER HALIDE SOLVENTS IN PHOTOGRAPHIC PROCESSING COMPOSITIONS HAVING A PH IN THE RANGE OF ABOUT 4 TO 9. IN A PREFERRED EMBODIMENT, COMPOSITIONS ARE PROVIDED WHICH FIND PARTICULAR UTILITY IN CARRYING OUT DIFFUSION TRANSFER PHOTOGRAPHIC PROCESS AT NEUTRALITY.
Inventors
- 👤 Stanley M Bloom
- 👤 Ronald F Lambert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:50
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/32; G03C8/36; G03C8/365
Claims Analysis
Total Claims: 0
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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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |