Patent US2692830A successfully refreshed from Google Patents.
US2692830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide transfer process
Assignee: Polaroid Corp
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Filing: 1950-02-02
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Granted: 1954-10-26
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Expires: 1970-02-02
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:20
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/44; G03C8/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
221 words
IN A PHOTOGRAPHIC PROCESS FOR FORMING BY TRANSFER A POSITIVE IMAGE IN A WATER-PERMEABLE OPAQUE LAYER COMPRISING IMAGE-RECEPTIVE MATERIAL OF A NATURE HAVING A VISUAL APPEARANCE IN CONTRAST TO DEVELOPED MASSES OF SILVER AND WHEREIN SAID OPAQUE LAYER HAS A FIRST SURFACE IN CONTACT WITH A FACE OF A PHOTOSENSITIVE ELEMENT WHICH INCLUDES A PHOTOGRAPHICALLY RESPONSIVE SILVER HALIDE LAYER, CONTAINING A LATENT NEGATIVE IMAGE, ADJACENT SAID FACE AND WHEREIN SAID OPAQUE LAYER HAS A SECOND SURFACE IN SUPERPOSED AND SPACED RELATION TO SAID FIRST SURFACE AND FORMING THE SIDE OF SAID OPAQUE LAYER FURTHEST FROM SAID PHOTOSENSITIVE ELEMENT AND FROM WHICH SAID TRANSFER IMAGE IS VIEWED, THE STEPS WHICH COMPRISE DISTRIBUTING A LIQUID COMPOSITION COMPRISING A PHOTOTOGRAPHIC SILVER HALIDE DEVELOPER AND A SILVER HALIDE SOLVENT WHICH FORMS A SOLUBLE AND REDUCIBLE SILVER COMPLEX WITH SILVER HALIDE SUBSTANTIAL LY UNIFORMLY OVER SAID SECOND SURFACE OF SAID OPAQUE LAYER TO UNIFORMLY AND EXCLUSIVELY PERMEATE SAID OPAQUE LAYER WITH SAID LIQUID AND TRANSPORTING LIQUID FROM SAID OPAQUE LAYER INTO SAID PHOTOGRAPHICALLY RESPONSIVE SILVER HALIDE LAYER, SAID DISTRIBUTION BEING UNDER SUCH CONDITIONS THAT SAID LIQUID COMPOSITION WETS SAID PHOTOGRAPHICALLY RESPONSIVE SILVER HALIDE LAYER ONLY THROUGH SAID OPAQUE LAYER, BY ABSORBING LIQUID FROM SAID OPAQUE LAYER THROUGH SAID FACE OF SAID PHOTOSENSITIVE ELEMENT IN CONTACT WITH SAID OPAQUE LAYER; DEVELOPING SAID LATENT IMAGE TO SILVER WITH
Claim 2
Dependent Claim
221 words
IN A PHOTOGRAPHIC PROCESS FOR FORMING BY TRANSFER A POSITIVE IMAGE IN A WATER-PERMEABLE OPAQUE LAYER COMPRISING IMAGE-RECEPTIVE MATERIAL OF A NATURE HAVING A VISUAL APPEARANCE IN CONTRAST TO DEVELOPED MASSES OF SILVER AND WHEREIN SAID OPAQUE LAYER HAS A FIRST SURFACE IN CONTACT WITH A FACE OF A PHOTOSENSITIVE ELEMENT WHICH INCLUDES A PHOTOGRAPHICALLY RESPONSIVE SILVER HALIDE LAYER, CONTAINING A LATENT NEGATIVE IMAGE, ADJACENT SAID FACE AND WHEREIN SAID OPAQUE LAYER HAS A SECOND SURFACE IN SUPERPOSED AND SPACED RELATION TO SAID FIRST SURFACE AND FORMING THE SIDE OF SAID OPAQUE LAYER FURTHEST FROM SAID PHOTOSENSITIVE ELEMENT AND FROM WHICH SAID TRANSFER IMAGE IS VIEWED, THE STEPS WHICH COMPRISE DISTRIBUTING A LIQUID COMPOSITION COMPRISING A PHOTOTOGRAPHIC SILVER HALIDE DEVELOPER AND A SILVER HALIDE SOLVENT WHICH FORMS A SOLUBLE AND REDUCIBLE SILVER COMPLEX WITH SILVER HALIDE SUBSTANTIAL LY UNIFORMLY OVER SAID SECOND SURFACE OF SAID OPAQUE LAYER TO UNIFORMLY AND EXCLUSIVELY PERMEATE SAID OPAQUE LAYER WITH SAID LIQUID AND TRANSPORTING LIQUID FROM SAID OPAQUE LAYER INTO SAID PHOTOGRAPHICALLY RESPONSIVE SILVER HALIDE LAYER, SAID DISTRIBUTION BEING UNDER SUCH CONDITIONS THAT SAID LIQUID COMPOSITION WETS SAID PHOTOGRAPHICALLY RESPONSIVE SILVER HALIDE LAYER ONLY THROUGH SAID OPAQUE LAYER, BY ABSORBING LIQUID FROM SAID OPAQUE LAYER THROUGH SAID FACE OF SAID PHOTOSENSITIVE ELEMENT IN CONTACT WITH SAID OPAQUE LAYER; DEVELOPING SAID LATENT IMAGE TO SILVER WITH
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) | 1957-10-25 | 1958-04-26 | 1958-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-25 | 1962-04-26 | 1962-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-25 | 1966-04-26 | 1966-10-26 | $7700.00 | Window Closed / Lapsed |