Patent US2443815A successfully refreshed from Google Patents.
US2443815A
Expired / Lapsed
US
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Tool for preparing contact blanks
Assignee: Duracell Inc USA
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Filing: 1944-03-13
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Granted: 1948-06-22
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Expires: 1964-03-13
Abstract
No abstract record available.
Inventors
- 👤 Dahl Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:02
CPC Classifications
B; B23; B23P; B23P11/00; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/965
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US531731A
Cited
US1729346A
Cited
US841577A
Cited
US1979472A
Cited
US1966663A
Cited
US2138404A
Cited
US2088978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-22 | 1951-12-22 | 1952-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-22 | 1955-12-22 | 1956-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-22 | 1959-12-22 | 1960-06-22 | $7700.00 | Window Closed / Lapsed |