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US2923623A Expired / Lapsed US ⏱️ 0.0 years remaining

Photographic process and product

Assignee: Polaroid Corp
•
Filing: 1955-03-14
•
Granted: 1960-02-02
•
Expires: 1975-03-14
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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 2026-10-26 12:48
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/52

Claims Analysis

Total Claims: 1
Claim 1
Independent Claim 269 words
IN A PHOTOGRAPHIC SILVER HALIDE TRANSFER PROCESS, THE STEPS WHICH COMPRISE FORMING A LAYER OF AN ALKALINE SOLUTION OF A SILVER HALIDE DEVELOPER AND A SILVER HALIDE TRANSFER AGENT BETWEEN ONE FACE OF A PRINT-RECEIVING ELEMENT AND ONE FACE OF A PHOTOSENSITIVE ELEMENT LOCATED IN SUPERPOSED RELATION TO THE PRINT-RECEIVING ELEMENT, SAID PHOTOSENSITIVE ELEMENT BEING PHOTOEXPOSED TO PROVIDE A LATENT IMAGE, SAID PHOTOSENSITIVE ELEMENT COMPRISING A PHOTOGRAPHIC FILM SUPPORT COMPOSED OF A PAPER MATERIAL, A STRATUM OF MATERIAL CONTAINING A FILM-FORMING POLYMERIC ACID, THE LAST-MENTIONED MATERIAL BEING SUBSTANTIALLY WATER IMPERMEABLE BUT PERMEABLE TO ALKALINE LIQUIDS AND BEING CARRIED BY ONE SIDE OF SAID SUPPORT AND A PHOTOEXPOSED SILVER HALIDE STRATUM CARRIED BY THE SURFACE OF THE WATERIMPERMEABLE BUT ALKALI-PERMEABLE STRATUM FURTHEST FROM SAID SUPPORT, ABSORBING SAID SOLUTION INTO SAID SILVER HALIDE STRATUM AND THROUGH SAID SILVER HALIDE STRATUM AND INTO THE STRATUM OF SAID WATER-IMPERMEABLE AND ALKALIPERMEABLE MATERIAL, AND, AS A RESULT OF SAID ABSORPTION, INCREASING THE RATE SAND THE AMOUNT OF THE REDUCTION OF THE THICKNESS OF SAID LAYER OF SOLUTION, BY MEANS OF SAID SOLUTION PRESENT IN SAID SILVER HALIDE STRATUM, DEVELOPING LATENT IMAGE SILVER HALIDE TO SILVER AND FORMING SILVER COMPLEXES SOLUBLE AND TRANSFERABLE IN SAID SOLUTION FROM SAID PHOTOSENSITIVE ELEMENT BY DIFFUSION FROM SAID PHOTOSENSIELEMENT, TRANSFERRING SAID SILVER COMPLEXES TOWARD SAID PRINT-RECEIVING ELEMENT BY DIFFUSION FROM SAID PHOTOSENSITIVE ELEMENT, AND REDUCING SAID SILVER COMPLEXES TO SILVER ADJACENT THE SAID FACE OF SAID PRINT-RECEIVING ELEMENT TO PROVIDE A REVERSE IMAGE OF THE LATENT IMAGE FORMED IN SAID PHOTOSENSITIVE ELEMENT, SAID STRATUM OF MATERIAL WHICH IS WATER-IMPERMEABLE BUT PERMEABLE TO ALKALINE LIQUIDS COMPRISING CELLULOSE ACETATE HYDROGEN PHTHALATE.

References Cited (Backward Citations)

US1954337A Cited
US2543181A Cited
US2559643A Cited
US2698798A Cited
US2565377A Cited
US2774668A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1963-02-01 1963-08-03 1964-02-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1967-02-01 1967-08-03 1968-02-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1971-02-01 1971-08-03 1972-02-02 $7700.00 Window Closed / Lapsed

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