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US3353957A Expired / Lapsed US ⏱️ 0.0 years remaining

Photographic process

Assignee: EIDP Inc
•
Filing: 1964-10-12
•
Granted: 1967-11-21
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Expires: 1984-10-12
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Abstract

No abstract record available.

Inventors

  • 👤 Blake Ralph Kingsley

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 17:41
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03C1/00; G03C1/005; G03C1/492

Claims Analysis

Total Claims: 1
Claim 1
Independent Claim 142 words
A PROCESS WHICH COMPRISES: (A) EXPOSING, IMAGEWISE, THE OUTER LIGHT-SENSITIVE SILVER HALIDE EMULSION LAYER OF A PHOTOGRRAPHIC ELEMENT HAVING A CONTIGUOUS INNER NON-FOGGED SILVER HALIDE LAYER ON A SUPPORT, THE SILVER SALT IN SAID INNER LAYER BEING AT LEAST AS SOLUBLE IN AQUEOUS DEVELOPER SOLUTION AS THE SILVER SALT IN THE OUTER LAYER, (B) DEVELOPING SAID EXPOSED OUTER LAYER TO FORM A SILVER IMAGE IN SAID LAYER, BY A DEVELOPER COMPOSITION SUBSTANTALLY DEVOID OF SILVER DIFFUSION TRANSFER CHARACTERISTICS; (C) DEVELOPING THE OUTER LAYER WITH AN AQUEOUS DEVELOPER SOLUTION HAVING SILVER DIFFUSION CHARACTERISTICS CONTAINING: (I) A DEVELOPING AGENT TAKEN FROM THE GROUP CONSISTING OF A POLYHYDROXYBENZEND, P-AMINOPHENOL AND 2,4-DIAMINOPHENOL, (II) AT LEAST ONE DEVELOPING AGENT TAKEN FROM THE GROUP CONSISTING OF A POLYHDROXYBENZEND, PAMINOPHENOL, 2,4-DIAMINOPHENOL, P-METHYLAMINOPHENOL, 1-PHENYL-3-PYRAZOLIDONE, 1-PHENYL-4METHYL-3-PYAZOLIDONE, AND ASCORBIC ACID, AND (III) A SILVER HALLIDE SOLVENT, AND (D) REMOVING THE OUTER LAYER.

References Cited (Backward Citations)

US2565376A Cited
US2647056A Cited
US2937945A Cited
US3050391A Cited
US3140179A Cited
US3146104A Cited
US3232759A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1970-11-20 1971-05-22 1971-11-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1974-11-20 1975-05-22 1975-11-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1978-11-20 1979-05-22 1979-11-21 $7700.00 Window Closed / Lapsed

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