Patent US2992102A successfully refreshed from Google Patents.
US2992102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic processes and products
Assignee: Polaroid Corp
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Filing: 1955-03-29
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Granted: 1961-07-11
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Expires: 1975-03-29
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:09
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03C8/32; G03C8/34
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
235 words
A PHOTOGRAPHIC PROCESS COMPRISING THE STEPS OF CREATING A PHOTOSENSITIVE STRATUM BY SPREADING BETWEEN TWO SHEETS, AT LEAST ONE OF WHICH IS SUFFICIENTLY TRANSPARENT TO PERMIT PHOTOEXPOSURE THERETHROUGH, A FLUID COMPOSITION CONTAINING FIRST MATERIALS, SAID FIRST MATERIALS BEING INTERMINGLED WITH SECOND MATERIALS INCLUDING PROCESSING REAGENTS FOR PHOTOSENSITIVE SILVER HALIDE SALT AS SAID FLUID COMPOSITION IS SPREAD BETWEEN SAID SHEETS, ONE OF SAID FIRST MATERIALS AND SAID SECOND MATERIALS INCLUDING A SALT HAVING SILVER CATIONS, THE OTHER OF SAID FIRST MATERIALS AND SAID SECOND MATERIALS INCLUDING A SALT HAVING HALIDE ANIONS, SAID PROCESSING REAGENTS INCLUDING A SILVER HALIDE SOLVENT AND A SILVER HALIDE DEVELOPER FOR SILVER HALIDE SALT IN CONDITION TO DEVELOP THE PHOTOSENSITIVE STRATUM FORMED BY THE REACTION OF SAID SALT HAVING SILVER CATIONS AND SAID SALT HAVING HALIDE ANIONS, SAID SILVER HALIDE SOLVENT BEING MAINTAINED APART FROM SAID SALT HAVING SILVER CATIONS BEFORE SAID SPREADING, AND IMMEDIATELY THEREAFTER PHOTOEXPOSING THROUGH SAID ONE OF SAID SHEETS SAID PHOTOSENSITIVE STRATUM TO FORM THEREIN A LATENT IMAGE FROM WHICH A POSITIVE IMAGE IS FORMED SPONTANEOUSLY, SAID POSITIVE IMAGE BEING FORMED BY REACTING SAID SILVER HALIDE DEVELOPER WITH EXPOSED SILVER HALIDE SALT TO REDUCE SAID EXPOSED SILVER HALIDE TO SILVER IN SAID PHOTOSENSITIVE STRATUM, REACTING SAID SILVER HALIDE SOLVENT WITH SILVER HALIDE SALT UNREDUCED BY SAID SILVER HALIDE DEVELOPER TO FORM A COMPLEX SILVER SALT, AND CONVERTING SAID COMPLEX SILVER SALT TO SILVER TO FORM SAID POSITIVE IMAGE.
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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) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |