Patent US3038801A successfully refreshed from Google Patents.
US3038801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic pyrazolidone developers in non-aqueous organic solvents
Assignee: PHILIP A HUNT Co
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Filing: 1960-02-18
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Granted: 1962-06-12
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Expires: 1980-02-18
Abstract
No abstract record available.
Inventors
- 👤 Gerald C Alletag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:07
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/264; G03C5/266; H; H04; H04B; H04B3/00; H04B3/02; H04B3/20; H04M; H04M1/00; H04M1/738; H04M1/74
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
THE METHOD OF PROVIDING AN AQUEOUS PHOTOGRAPHIC DEVELOPING BATH INCLUDING A 3-PYRAZOLIDONE REDUCING AGENT, WHICH COMPRISES STORING THE 3-PYRAZOLIDE REDUCING AGENT IN A SOLUTION, SAID SOLUTION BEING SUBSTANTIALLY STABLE AGAINST HYDROLYSIS, THE SOLVENT OF SAID SOLUTION BEING ORGANIC AND SUBSTANTIALLY NON-AQUEOUS, SAID SOLUTION BEING FREELY MISCIBLE WITH WATER AT 20*C.-30*C. THE SOLUBILITY OF SAID 3-PYRAZOLIDONE IN SAID ORGANIC SOLVENT AT 20*C.-30*C. BEING AN AMOUNT CORRESPONDING TO AT LEAST FIVE GRAMS OF 1-PHENYL-3-PYRAZOLIDONE PER ONE HUNDRED MILLILITERS OF SAID SOLVENT, SAID SOLUTION BEING SUFFICIENTLY FREE FROM WATER TO BE SUBSTANTIALLY STABLE AGAINST HYDROLYSIS DURING A STORAGE PERIOD OF AT LEAST 55*C., AND INSTORAGE TEMPERATURE OF 20*C. TO AT LEAST A YEAR AT A CORPORATING SAID SOLUTION INTO AN AQUEOUS MEDIUM FOR PROVIDING A DEVELOPING BATH, WHEREBY A BATH CONTAINING 3-PYRAZOLIDONE REDUCING AGENT HAVING SUBSTANTIALLY FULL SPEED, CONTRAST, AND CAPACITY IS PROVIDED.
Claim 2
Independent Claim
140 words
THE METHOD OF PROVIDING AN AQUEOUS PHOTOGRAPHIC DEVELOPING BATH INCLUDING A 3-PYRAZOLIDONE REDUCING AGENT, WHICH COMPRISES STORING THE 3-PYRAZOLIDE REDUCING AGENT IN A SOLUTION, SAID SOLUTION BEING SUBSTANTIALLY STABLE AGAINST HYDROLYSIS, THE SOLVENT OF SAID SOLUTION BEING ORGANIC AND SUBSTANTIALLY NON-AQUEOUS, SAID SOLUTION BEING FREELY MISCIBLE WITH WATER AT 20*C.-30*C. THE SOLUBILITY OF SAID 3-PYRAZOLIDONE IN SAID ORGANIC SOLVENT AT 20*C.-30*C. BEING AN AMOUNT CORRESPONDING TO AT LEAST FIVE GRAMS OF 1-PHENYL-3-PYRAZOLIDONE PER ONE HUNDRED MILLILITERS OF SAID SOLVENT, SAID SOLUTION BEING SUFFICIENTLY FREE FROM WATER TO BE SUBSTANTIALLY STABLE AGAINST HYDROLYSIS DURING A STORAGE PERIOD OF AT LEAST 55*C., AND INSTORAGE TEMPERATURE OF 20*C. TO AT LEAST A YEAR AT A CORPORATING SAID SOLUTION INTO AN AQUEOUS MEDIUM FOR PROVIDING A DEVELOPING BATH, WHEREBY A BATH CONTAINING 3-PYRAZOLIDONE REDUCING AGENT HAVING SUBSTANTIALLY FULL SPEED, CONTRAST, AND CAPACITY IS PROVIDED.
Claim 3
Dependent Claim
100 words
A SOLUTION OF A 3-OYRAZOLIDONE DEVELOPING AGENT, SAID SOLUTION BEING SUBSTANTIALLY STABLE AGAINST HYDROLYSIS, THE SOLVENT OF SAID SOLUTION BEING ORGANIC AND SUBSTANTIALLY NON-AQUEOUS, SAID SOLUTION BING ORGANIC AND SUBWITH WATER AT 20*C.-30*C., THE SOLUBILITY OF SAID 3PYRAZOLIDONE IN SAID ORGANIC SOLVENT AT 2/*C.-30*C. BEING AN AMOUNT CORRESPONDING TO AT LEAST FIVE GRAMS OF 1-PHENYL-3-PYRAZOLIDONE PER ONE HUNDRED MILLILITIES OF SAID SOLVENT, SAID SOLUTION BEING SUFFICIENT FREE FROM WATER TO BE SUBSTANTIALLY STABLE AGAINST HYDROLYSIS DURING A STORAGE PERIOD OF AT LEAST 55*C. SAID SOLUTION FURTHER ATURE OF 20*C. TO AT LEAST 55*C. SAID SOLUTION FURTHER HAVING HYDROQUINONE DISSOLVED THEREIN.
Claim 4
Dependent Claim
100 words
A SOLUTION OF A 3-OYRAZOLIDONE DEVELOPING AGENT, SAID SOLUTION BEING SUBSTANTIALLY STABLE AGAINST HYDROLYSIS, THE SOLVENT OF SAID SOLUTION BEING ORGANIC AND SUBSTANTIALLY NON-AQUEOUS, SAID SOLUTION BING ORGANIC AND SUBWITH WATER AT 20*C.-30*C., THE SOLUBILITY OF SAID 3PYRAZOLIDONE IN SAID ORGANIC SOLVENT AT 2/*C.-30*C. BEING AN AMOUNT CORRESPONDING TO AT LEAST FIVE GRAMS OF 1-PHENYL-3-PYRAZOLIDONE PER ONE HUNDRED MILLILITIES OF SAID SOLVENT, SAID SOLUTION BEING SUFFICIENT FREE FROM WATER TO BE SUBSTANTIALLY STABLE AGAINST HYDROLYSIS DURING A STORAGE PERIOD OF AT LEAST 55*C. SAID SOLUTION FURTHER ATURE OF 20*C. TO AT LEAST 55*C. SAID SOLUTION FURTHER HAVING HYDROQUINONE DISSOLVED THEREIN.
References Cited (Backward Citations)
US2289367A
Cited
GB650911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-11 | 1965-12-11 | 1966-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-11 | 1969-12-11 | 1970-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-11 | 1973-12-11 | 1974-06-12 | $7700.00 | Window Closed / Lapsed |