Patent US2440589A successfully refreshed from Google Patents.
US2464022A
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Electrical unit closure
Assignee: Duracell Inc USA
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Filing: 1945-06-15
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Granted: 1949-03-08
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Expires: 1965-06-15
Abstract
No abstract record available.
Inventors
- 👤 Glenn W Carpenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:08
CPC Classifications
H; H01; H01G; H01G2/00; H01G2/10; H01G2/103; H01G9/00; H01G9/004; H01G9/08; H01G9/10; Y; Y10; Y10T; Y10T292/00; Y10T292/20; Y10T292/205; Y10T292/209
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US212064A
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US929974A
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US786296A
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US780732A
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US1123733A
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US2202166A
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US2379053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-03-07 | 1952-09-06 | 1953-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-03-07 | 1956-09-06 | 1957-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-03-07 | 1960-09-06 | 1961-03-08 | $7700.00 | Window Closed / Lapsed |