US3669753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reserve cell,spring-controlled
Assignee: Duracell Inc USA
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Filing: 1970-09-22
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Granted: 1972-06-13
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Expires: 1990-09-22
Abstract
Abstract A base or support of conducting metal provided with a zinc surface, alloyed or electroplated, is amalgam alloyed with mercury, and has bonded to said amalgam a porous body of zinc particles individually amalgam covered with stabilized austenite stainless steel to solution heat treatment, cold-working said steel more than 15%, and annealing it at a temperature between 850 degrees C. and 950 degrees C. for less than four hours.
Inventors
- 👤 Gordon E Kaye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:57
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/30; H01M6/36; H01M6/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |