US3704126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver image stabilization with noble metal compounds
Assignee: Polaroid Corp
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Filing: 1970-12-07
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Granted: 1972-11-28
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Expires: 1990-12-07
Abstract
Abstract THE PRESENT INVENTION RELATES TO A PHOTOGRAPHIC SILVER DIFFUSION TRANSFER PROCESS WHICH COMPRISES, IN ESSENCE, EXPOSING A SILVER DIFFUSION TRANSFER FILM UNIT WHICH COMPRISES PHOTOSENSITIVE SILVER HALIDE AND SILVER PRECIPITATING NUCLEI; CONTACTING THE EXPOSED FILM UNIT WITH A PROCESSING COMPOSITION WHICH COMPRISES A SILVER HALIDE DEVELOPING AGENT AND A SILVER HALIDE SOLVENT TO PROVIDE A VISIBLE SILVER IMAGE TO THE UNIT, AS A FUNCTION OF EXPOSURE; AND COACTING THE SILVER IMAGE WITH A NOBLE BELOW SILVER IN THE ELECTROMOTIVE FORCE SERIES OF ELEMENTS AT A CONCENTRATION EFFECTIVE TO ENHANCE STABILITY OF A SILVER IMAGE PROVIDED BY DIFFUSION TRANSFER PROCESSING OF THE FILM UNIT.
Inventors
- 👤 Edwin H Land
- 👤 Stanley M Bloom
- 👤 Leonard C Farney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:19
CPC Classifications
G; G03; G03C; G03C8/00; 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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |