Patent US3864129A successfully refreshed from Google Patents.
US3864129A
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Photographic activating bath
Assignee: EIDP Inc
•
Filing: 1973-01-12
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Granted: 1975-02-04
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Expires: 1993-01-12
Abstract
Abstract Improved photographic activating baths containing at least one low-molecular weight, aliphatic alcohol give improved image density for photographic films containing developing agents.
Inventors
- 👤 Manfred Schober
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:49
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/262
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
17 words
A photographic activating bath according to claim 1 wherein said alcohol is methanol, ethanol, propanol, or butanol.
Claim 2
Dependent Claim
18 words
A photogrAphic activating bath according to claim 1 wherein the bath contains a mixture of ethanol and tertiary-butanol.
Claim 3
Dependent Claim
30 words
A photographic activating bath according to claim 1 which comprises 5 to 60 grams/liter of alkali, 2 to 60 grams/liter of preservative and 100 to 600 milliliters/liter of said alcohol.
Claim 4
Dependent Claim
15 words
A photograhic activating bath according to claim 1 having a pH between 10 and 13.
References Cited (Backward Citations)
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Cited
US3464821A
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US3294536A
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US3529962A
Cited
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Cited
US3653904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |