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US2692830A Expired / Lapsed US ⏱️ 0.0 years remaining

Photographic silver halide transfer process

Assignee: Polaroid Corp
•
Filing: 1950-02-02
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Granted: 1954-10-26
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Expires: 1970-02-02
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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)

GB361873A Cited
FR873507A Cited
FR879995A Cited
US2352014A Cited

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

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