US2669512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric contact material and method of making the same
Assignee: Duracell Inc USA
•
Filing: 1951-01-09
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Granted: 1954-02-16
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Expires: 1971-01-09
Abstract
No abstract record available.
Inventors
- 👤 Earl I Larsen
- 👤 Arnold S Doty
- 👤 Donald A Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:13
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0237; H01H1/02372; H01H1/02374
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2057604A
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US2145690A
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US2161575A
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US2207292A
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US2396101A
Cited
US2539298A
Cited
GB611313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |