Patent US3330657A successfully refreshed from Google Patents.
US3330657A
Expired / Lapsed
US
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Photographic products and processes utilizing 2, 5-dimercapto-1, 3, 4-thiadiazole as an antifoggant
Assignee: Polaroid Corp
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Filing: 1963-10-23
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Granted: 1967-07-11
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Expires: 1983-10-23
Abstract
No abstract record available.
Inventors
- 👤 Peter H Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:41
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/24; G03C8/243; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C1/346
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
99 words
IN A PROCESS FOR FORMING DIFFUSION TRANSFER IMAGES IN COLOR WHICH COMPRISES THE STEPS OF DEVELOPING AN EXPOSED SILVER HALIDE EMULSION IN THE PRESENCE OF A DYE, SAID DYE BEING A SILVER HALIDE DEVELOPING AGENT, IMMOBILIZING SAID DYE IN THE EXPOSED AREAS AS A RESULTANT OF DEVELOPMENT, FORMING THEREBY AN IMAGEWISE DISTRIBUTION OF MOBILE DYE IN UNEXPOSED AREAS, AND TRANSFERRING, BY IMBIBITION, AT LEAST A PORTION OF SAID IMAGEWISE DISTRIBUTION OF MOBILE DYE TO A SUPERPOSED IMAGE-RECEIVING LAYER TO PROVIDE THEREON A POSITIVE DYE IMAGE, THE IMPROVEMENT WHICH COMPRISES CONDUCTING SAID PROCESS IN THE PRESENCE OF A 2,5-DIMERCAPTO-1,3,4-THIADIAZOLE ANTIFOGGANT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |