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US3345166A Expired / Lapsed US ⏱️ 0.0 years remaining

Photographic process whereby a fully developed and fixed negative is formed concurrently with a positive silver transfer image

Assignee: Polaroid Corp
•
Filing: 1961-03-09
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Granted: 1967-10-03
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Expires: 1981-03-09
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Abstract

No abstract record available.

Inventors

  • 👤 Edwin H Land
  • 👤 Meroe M Morse
  • 👤 Elizabeth L Yankowski

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 13:54
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38; G03C5/383; G03C8/00; G03C8/02; G03C8/04; G03C8/06

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 245 words
A PROCESS OF FORMING A FULLY DEVELOPED AND FIXED OUT NEGATIVE CONCURRENTLY WITH THE FORMATION OF A SILVER TRANSFER IMAGE COMPRISING DEVELOPING AN EXPOSED SILVER HALIDE EMULSION LAYER, SAID EMULSION BEING A SILVER IODOBROMIDE EMULSION THE GRAINS OF WHICH HAVE AN AVERAGE DIAMETER OF APPROXIMATELY 1 TO 2U, WITH A PROCESSING FLUID INCLUDING AN ALKALI, A SILVER HALIDE DEVELOPING AGENT, A VISCOSITY-INCREASING, FILM-FORMING REAGENT, SAID FILM-FORMING REAGENT BEING SELECTED FROM THE GROUP CONSISTING OF SODIUM CARBOXYMETHYL CELLULOSE AND HYDROXYETHYL CELLULOSE, AND A SILVER HALIDE SOLVENT CAPABLE OF FORMING WATER-SOLUBLE COMPLEXES WITH UNEXPOSED AND UNDEVELOPED SILVER HALIDE, SAID SILVER HALIDE SOLVENT BEING PRESENT IN A CONCENTRATION, BY WEIGHT, IN EXCESS OF THE CONCENTRATION OF SAID ALKALI, SAID SILVER HALIDE SOLVENT BEING PRESENT IN A CONCENTRATION APPROXIMATELY AT LEAST 4 TIMES THAT CONCENTRATION NECESSARY TO OBTAIN A SILVER TRANSFER IMAGE HAVING A MAXIMUM DENSITY IN EXCESS OF 1.0 IN 1 MINUTE WITH THE SAME SILVER HALIDE EMULSION LAYER, FORMING AN IMAGEWISE DISTRIBUTION OF SAID SOLUBLE SILVER COMPLEX IN UNDEVELOPED AREAS, TRANSFERRING SAID SOLUBLE SILVER COMPLEX TO A SUPERPOSED IMAGE-RECEIVING LAYER TO FORM A POSITIVE SILVER TRANSFER IMAGE AND SEPARATING SAID IMAGE-RECEIVING LAYER AND SAID SILVER HALIDE EMULSION LAYER, SAID SEPARATED SILVER HALIDE EMULSION LAYER BEING INSENSITIVE TO FURTHER ACTINIC RADIATION AND CONTAINING A FULLY DEVELOPED AND FIXED OUT NEGATIVE IMAGE, THE SILVER OF SAID NEGATIVE AND POSITIVE IMAGES HAVING HIGH COVERING POWER AND SAID NEGATIVE THE POSITIVE IMAGES EACH HAVING A MAXIMUM DENSITY IN EXCESS OF 1.0.
Claim 2
Dependent Claim 245 words
A PROCESS OF FORMING A FULLY DEVELOPED AND FIXED OUT NEGATIVE CONCURRENTLY WITH THE FORMATION OF A SILVER TRANSFER IMAGE COMPRISING DEVELOPING AN EXPOSED SILVER HALIDE EMULSION LAYER, SAID EMULSION BEING A SILVER IODOBROMIDE EMULSION THE GRAINS OF WHICH HAVE AN AVERAGE DIAMETER OF APPROXIMATELY 1 TO 2U, WITH A PROCESSING FLUID INCLUDING AN ALKALI, A SILVER HALIDE DEVELOPING AGENT, A VISCOSITY-INCREASING, FILM-FORMING REAGENT, SAID FILM-FORMING REAGENT BEING SELECTED FROM THE GROUP CONSISTING OF SODIUM CARBOXYMETHYL CELLULOSE AND HYDROXYETHYL CELLULOSE, AND A SILVER HALIDE SOLVENT CAPABLE OF FORMING WATER-SOLUBLE COMPLEXES WITH UNEXPOSED AND UNDEVELOPED SILVER HALIDE, SAID SILVER HALIDE SOLVENT BEING PRESENT IN A CONCENTRATION, BY WEIGHT, IN EXCESS OF THE CONCENTRATION OF SAID ALKALI, SAID SILVER HALIDE SOLVENT BEING PRESENT IN A CONCENTRATION APPROXIMATELY AT LEAST 4 TIMES THAT CONCENTRATION NECESSARY TO OBTAIN A SILVER TRANSFER IMAGE HAVING A MAXIMUM DENSITY IN EXCESS OF 1.0 IN 1 MINUTE WITH THE SAME SILVER HALIDE EMULSION LAYER, FORMING AN IMAGEWISE DISTRIBUTION OF SAID SOLUBLE SILVER COMPLEX IN UNDEVELOPED AREAS, TRANSFERRING SAID SOLUBLE SILVER COMPLEX TO A SUPERPOSED IMAGE-RECEIVING LAYER TO FORM A POSITIVE SILVER TRANSFER IMAGE AND SEPARATING SAID IMAGE-RECEIVING LAYER AND SAID SILVER HALIDE EMULSION LAYER, SAID SEPARATED SILVER HALIDE EMULSION LAYER BEING INSENSITIVE TO FURTHER ACTINIC RADIATION AND CONTAINING A FULLY DEVELOPED AND FIXED OUT NEGATIVE IMAGE, THE SILVER OF SAID NEGATIVE AND POSITIVE IMAGES HAVING HIGH COVERING POWER AND SAID NEGATIVE THE POSITIVE IMAGES EACH HAVING A MAXIMUM DENSITY IN EXCESS OF 1.0.

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) 1970-10-02 1971-04-03 1971-10-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1974-10-02 1975-04-03 1975-10-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1978-10-02 1979-04-03 1979-10-03 $7700.00 Window Closed / Lapsed

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