Patent US3158482A successfully refreshed from Google Patents.
US3158482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry photographic processing formulation
Assignee: Individual
•
Filing: 1961-07-28
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Granted: 1964-11-24
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Expires: 1981-07-28
Abstract
No abstract record available.
Inventors
- 👤 Lucas Christopher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:08
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/264; G03C5/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A DRY PHOTOGRAPHIC DVELOPING FORMULATION CONSISTING IN PARTS BY WEIGHT OF 2 PARTS PYROCATECHIN, 1 PART SODIUM HYDROXIDE AND 3 PARTS TAKEN FROM A MIXTURE OF 20 PARTS OF POTASSIUM CITRATE, 47.7 PARTS OF SODIUM BICARBONATE, 25.2 PARTS OF TARTARIC ACID, AND 16.2 PARTS OF CITRIC ACID.
Claim 2
Dependent Claim
47 words
A DRY PHOTOGRAPHIC DVELOPING FORMULATION CONSISTING IN PARTS BY WEIGHT OF 2 PARTS PYROCATECHIN, 1 PART SODIUM HYDROXIDE AND 3 PARTS TAKEN FROM A MIXTURE OF 20 PARTS OF POTASSIUM CITRATE, 47.7 PARTS OF SODIUM BICARBONATE, 25.2 PARTS OF TARTARIC ACID, AND 16.2 PARTS OF CITRIC ACID.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |