US3050392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation-stable developer compositions
Assignee: Mergenthaler Linotype GmbH
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Filing: 1958-08-01
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Granted: 1962-08-21
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Expires: 1978-08-01
Abstract
No abstract record available.
Inventors
- 👤 Eerde John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:53
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; Y; Y10; Y10S; Y10S430/00; Y10S430/167
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
69 words
A ONE-BATH PHOTOGRAPHIC DEVELOPER-FIXER HAVING INCREASED STABILITY AGAINST AERIAL OXIDATION CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF BENZSOTRIAZOLE; POTASSIUM BROMIDE; HYDROQUINONE; SODIUM SULFITE; THIOSULFATE; A COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONOMETHYL PARA AMINOPHENOL SULFATE AND 1-PHENYL-3-PYRAZOLIDONE; A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL PHOSPAHTE, ALKALI METAL CARBONATE AND ALKALI METAL HYDROXIDE; AND A CONCENTRATION OF FROM ABOUT 1% TO ABOUT 10% ALKALI METAL ARSENITE.
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) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |