US2782121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined developer and fixer
Assignee: Individual
•
Filing: 1954-02-15
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Granted: 1957-02-19
•
Expires: 1974-02-15
Abstract
No abstract record available.
Inventors
- 👤 Goldhammer Jerome Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:40
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38; G03C5/383
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IN A CHEMICAL COMPOSITION OF INCREASED ACTIVITY AND HAVING IN AQUEOUS SOLUTION OF PH VALUE NOT IN EXCESS OF 9.5 AND ADAPTED FOR COMBINED DEVELOPING AND FIXING OF SILVER HALIDE PHOTOGRAPHIC EMULSIONS, CONTAINING A DEVELOPING AGENT SELECTED FROM THE GROUP CONSISTING OF 2,4 DIAMINOPHENOL, 2,4 DIAMINORESORCINOL, 6-METHYL 2,4, DIAMINO-PHENOL, 5-METHYL 2,4 DIAMLINOPHENOL, 4-AMINO6 - METHYL - 2 - METHYL - AMINO - PHENOL, 6 - AMINO - 4 METHYL-2-METHYLAMINO-PHENOL, 5 DIMETHYLAMINO-2-METHYLAMINO-PHENOL, 1,2,4, TRIAMINO-BENZENE, 5-METHYL 1,2,4 TRIAMINO BENZENE, 4 HYDROXY :2''4'' DIAMINODIPHENYLAMINE, 4 : 2''4'' TRIAMINODIPHENYLAMINE, AND 1,3 DIAMINO 4,6 DIHYDROXYBENZENE; AND A DIHYDROXYBENZENE SELECTED FROM THE GROUP CONSISTING OF PYROCATECHOL, RESORCINOL AND HYDROQUINONE; THE RATIO OF THE DIHYDROXYBENZENE TO THE DEVELOPING AGENT BEING IN THE RANGE FROM 9.5% TO 200% BY WEIGHT, THE COMBINATION OF AN ALKALI METAL HYDROXIDE AND AMONIUM THIOSULFATE.
Claim 2
Dependent Claim
132 words
IN A CHEMICAL COMPOSITION OF INCREASED ACTIVITY AND HAVING IN AQUEOUS SOLUTION OF PH VALUE NOT IN EXCESS OF 9.5 AND ADAPTED FOR COMBINED DEVELOPING AND FIXING OF SILVER HALIDE PHOTOGRAPHIC EMULSIONS, CONTAINING A DEVELOPING AGENT SELECTED FROM THE GROUP CONSISTING OF 2,4 DIAMINOPHENOL, 2,4 DIAMINORESORCINOL, 6-METHYL 2,4, DIAMINO-PHENOL, 5-METHYL 2,4 DIAMLINOPHENOL, 4-AMINO6 - METHYL - 2 - METHYL - AMINO - PHENOL, 6 - AMINO - 4 METHYL-2-METHYLAMINO-PHENOL, 5 DIMETHYLAMINO-2-METHYLAMINO-PHENOL, 1,2,4, TRIAMINO-BENZENE, 5-METHYL 1,2,4 TRIAMINO BENZENE, 4 HYDROXY :2''4'' DIAMINODIPHENYLAMINE, 4 : 2''4'' TRIAMINODIPHENYLAMINE, AND 1,3 DIAMINO 4,6 DIHYDROXYBENZENE; AND A DIHYDROXYBENZENE SELECTED FROM THE GROUP CONSISTING OF PYROCATECHOL, RESORCINOL AND HYDROQUINONE; THE RATIO OF THE DIHYDROXYBENZENE TO THE DEVELOPING AGENT BEING IN THE RANGE FROM 9.5% TO 200% BY WEIGHT, THE COMBINATION OF AN ALKALI METAL HYDROXIDE AND AMONIUM THIOSULFATE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-19 | 1960-08-20 | 1961-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-19 | 1964-08-20 | 1965-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-19 | 1968-08-20 | 1969-02-19 | $7700.00 | Window Closed / Lapsed |