Patent US3653904A successfully refreshed from Google Patents.
US3653904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid photographic processing solutions and method
Assignee: Visual Graphics Corp
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Filing: 1970-02-13
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Granted: 1972-04-04
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Expires: 1990-02-13
Abstract
Abstract Rapid processing of exposed photosensitive materials is achieved by the use of alkaline hydroquinone developers at an elevated temperature of from 75* to 125* F.
Inventors
- 👤 Murray Friedel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:50
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
The method of claim 1, wherein said third bath contains also from 0 to 2.78 percent by weight of monosodium phosphate and 0 to 1.21 percent by weight of sodium sulfite.
Claim 2
Dependent Claim
71 words
The method of claim 1, wherein the washed materials are fully fixed by passing them for about 7 seconds at about 75* and 120* F. through a fifth bath containing 94.75 percent by weight of water, 0.28 percent by weight of sodium benzoate, 1.42 percent by weight of isopropyl alcohol, 1.42 percent by weight of acetic acid, 1.42 percent by weight of glycerine, and 0.71 percent by weight of ethylene glycol.
References Cited (Backward Citations)
US3345174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |