Patent US3276873A successfully refreshed from Google Patents.
US3276873A
Expired / Lapsed
US
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Photographic processes
Assignee: Polaroid Corp
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Filing: 1965-10-23
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Granted: 1966-10-04
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Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 Green Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:48
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PHOTOGRAPHIC PROCESS WHICH COMPRISES THE STEPS OF UNDEREXPOSING A PHOTENSISITIVE SILVER HALIDE EMULSION WITH RESPECT TO ITS A.S.A. EXPOSURE INDEX TO PRODUCE THEREIN A LATENT IMAGE HAVING AN EXPOSURE GRADIENT IN THE TOE REGION OF THE A.S.A. DENSITY VERSUS LOG EXPOSURE CURVE OF SAID SILVER HALIDE EMULSION, DEVELOPING SAID EMULSION WITH AN AQUEOUS ALKALINE SOLUTION HAVING A PH IN EXCESS OF ABOUT 12 AND CONTAINING A SILVER HALIDE DEVELOPING AGENT OF THE FORMULA:
Claim 2
Dependent Claim
74 words
A PHOTOGRAPHIC PROCESS WHICH COMPRISES THE STEPS OF UNDEREXPOSING A PHOTENSISITIVE SILVER HALIDE EMULSION WITH RESPECT TO ITS A.S.A. EXPOSURE INDEX TO PRODUCE THEREIN A LATENT IMAGE HAVING AN EXPOSURE GRADIENT IN THE TOE REGION OF THE A.S.A. DENSITY VERSUS LOG EXPOSURE CURVE OF SAID SILVER HALIDE EMULSION, DEVELOPING SAID EMULSION WITH AN AQUEOUS ALKALINE SOLUTION HAVING A PH IN EXCESS OF ABOUT 12 AND CONTAINING A SILVER HALIDE DEVELOPING AGENT OF THE FORMULA:
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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |