US2775534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Primary dry cell
Assignee: Spectrum Brands Inc
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Filing: 1953-08-31
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Granted: 1956-12-25
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Expires: 1973-08-31
Abstract
No abstract record available.
Inventors
- 👤 William S Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:26
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/06; H01M4/08; H01M50/00; H01M50/50; H01M50/543; H01M50/552; H01M50/559; H01M50/56; H01M6/00; H01M6/04; H01M6/06; H01M6/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
IN AN ALKALINE DRY CELL HAVING AN AMALGAMATED ZINC ANODE AND A CATHODE-DEPOLARIZER CONTAINING GRAPHITE AND MANGANESE DIOXIDE, AN ALKALINE ELECTROLYTE WHICH COMPRISES A SOLUTION OF ALKALI METAL HYDROXIDE IN WATER, SAID HYDROXIDE BEING INITIALLY PRESENT IN AN AMOUNT BETWEEN ABOUT 20 PERCENT, BY WEIGHT, AND ABOUT 75 PERCENT, BY WEIGHT, OF THE WATER PRESENT, AND SAID SOLUTION CONTAINING DISSOLVED ALKALI METAL ZINCATE AND DISSOLVED UNREACTED ALKALI METAL HYDROXIDE IN PROPORTIONS BY WEIGHT WHICH FALL BETWEEN THE RATIOS OF FROM ABOUT 3.1 PARTS TO ABOUT 25 PARTS OF ALKALI METAL HYDROXIDE FOR EACH PART OF ALKALI METAL ZINCATE.
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) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |