US3291607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble polyoxyalkylenated butyne-2-diol-1, 4 development accelerators
Assignee: GAF Chemicals Corp
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Filing: 1965-05-28
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Granted: 1966-12-13
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Expires: 1985-05-28
Abstract
No abstract record available.
Inventors
- 👤 Dersch Fritz
- 👤 Betty D Fadden
- 👤 William L Wike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:49
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C5/3056
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
AN AQUEOUS DEVELOPER SOLUTION CONTAINING A SILVER HALIDE PHOTOGRAPHIC DEVELOPING AGENT AND A SMALL AMOUNT OF A DEVELOPMENT ACCELERATOR COMPRISING A WATER-SOLUBLE POLYOXYALKYLENATED BUTYNE-2-DIOL-1,4 OF THE FORMULA: FFIG-01 WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF ETHYLENE AND PROPYLENE AND R1,R2,R3, AND R4 ARE INDEPENDENTLY SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND LOWER ALKYL AND WHEREIN M AND N REPRESENT POSITIVE INTEGERS THE SUM OF WHICH HAS A MINIMUM AVERAGE VALUE OF AT LEAST 7. ). A REVERSAL PROCESS OF PHOTOGRAPHY IS WHICH AN EXPOSED PHOTOGRAPHIC ELEMENT HAVING AT LEAST ONE LIGHTSENSITIVE HALIDE EMULSION LAYER CONTAINING A NONDIFFUSING COLOR FORMER IS (A) GIVEN A FIRST DEVELOPMENT IN AN AQUEOUS ALKALINE DEVELOPING SOLUTION CONTAINING A SILVER HALIDE DEVELOPING AGENT TO FORM SILVER IMAGES ONLY, (B) RE-EXPOSED TO LIGHT, (C) GIVEN A SECOND DEVELOPMENT IN AN AQUEOUS DEVELOPER SOLUTION CONTAINING A PRIMARY AROMATIC AMINO COLOR DEVELOPING AGENT TO FORM BOTH SILVER AND DYE IMAGES IN THE REVERSE AREAS OF SAID EMULSION LAYER; SAID PROCESS BEING CHARACTERIZED IN THAT THE FIRST DEVELOPMENT IS CARRIED OUT IN THE PRESENCE OF A DEVELOPMENT ACCELERATOR COMPRISING WATER-SOLUBLE POLYOXYALKLENATED BUTYNE-2-DIOL-1,4 OF THE FORMULA:
Claim 2
Dependent Claim
188 words
AN AQUEOUS DEVELOPER SOLUTION CONTAINING A SILVER HALIDE PHOTOGRAPHIC DEVELOPING AGENT AND A SMALL AMOUNT OF A DEVELOPMENT ACCELERATOR COMPRISING A WATER-SOLUBLE POLYOXYALKYLENATED BUTYNE-2-DIOL-1,4 OF THE FORMULA: FFIG-01 WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF ETHYLENE AND PROPYLENE AND R1,R2,R3, AND R4 ARE INDEPENDENTLY SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND LOWER ALKYL AND WHEREIN M AND N REPRESENT POSITIVE INTEGERS THE SUM OF WHICH HAS A MINIMUM AVERAGE VALUE OF AT LEAST 7. ). A REVERSAL PROCESS OF PHOTOGRAPHY IS WHICH AN EXPOSED PHOTOGRAPHIC ELEMENT HAVING AT LEAST ONE LIGHTSENSITIVE HALIDE EMULSION LAYER CONTAINING A NONDIFFUSING COLOR FORMER IS (A) GIVEN A FIRST DEVELOPMENT IN AN AQUEOUS ALKALINE DEVELOPING SOLUTION CONTAINING A SILVER HALIDE DEVELOPING AGENT TO FORM SILVER IMAGES ONLY, (B) RE-EXPOSED TO LIGHT, (C) GIVEN A SECOND DEVELOPMENT IN AN AQUEOUS DEVELOPER SOLUTION CONTAINING A PRIMARY AROMATIC AMINO COLOR DEVELOPING AGENT TO FORM BOTH SILVER AND DYE IMAGES IN THE REVERSE AREAS OF SAID EMULSION LAYER; SAID PROCESS BEING CHARACTERIZED IN THAT THE FIRST DEVELOPMENT IS CARRIED OUT IN THE PRESENCE OF A DEVELOPMENT ACCELERATOR COMPRISING WATER-SOLUBLE POLYOXYALKLENATED BUTYNE-2-DIOL-1,4 OF THE FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |