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US3794485A Expired / Lapsed US ⏱️ 0.0 years remaining

Color diffusion transfer film with incorporated dye and desensitizing agent precursor

Assignee: Polaroid Corp
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Filing: 1972-06-09
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Granted: 1974-02-26
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Expires: 1992-06-09
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Abstract

Abstract THE PRESENT INVENTION IS DIRECTED TO A PHOTOGRAPHIC FILM UNIT ADAPTED TO PROVIDE, BY DIFFUSION TRANSFER PROCESSING, SELECTIVE DYE IMAGE RECORDATION OF INCIDENT ACTINIC RADIATION AS A REDUCTION OF THE POINT-TO-POINT DEGREE OF PHOTOSENSITIVE ELEMENT EXPOSURE WHICH FILM UNIT INCLUDES A PLURALITY OF LAYERS INCLUDING A PHOTOSENSSITIVE SLVER HALIDE LAYER HAVING ASSOCIATED THEREWITH DYE IMAGE-FORMING MATERIAL WHICH IS DIFFUSIBLE AS A FUNCTION OF THE POINT-TO-POINT DEGREE OF SILVER HALIDE LAYER EXPOSURE TO ACTINIC RADIATION; AND, ASSOCIAED WITH AT LAST ONE OF SAID SILVER HALIDE LAYERS AN INITALLY SUBSTANTIAALY COLORLESS,PH0TOGRAPHICALLY INACTIVE COMPOUND, ADAPTED TO PTOVIDE A COLORED MOIETY WHICH CAN FUNCTION TO PREVENT PHOTO EXPOSURE OF THE SILVER HALIDE LAYER WHEN THE FILM UNIT IS REMOVED FROM THE CAMERA FOR PROCESSING.

Inventors

  • 👤 S Bloom
  • 👤 A Borror
  • 👤 R Greenwald

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 18:54
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/44; G03C8/48

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

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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) 1977-02-25 1977-08-27 1978-02-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-02-25 1981-08-27 1982-02-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-02-25 1985-08-27 1986-02-26 $7700.00 Window Closed / Lapsed

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