Patent US2674321A successfully refreshed from Google Patents.
US1401708A
Expired / Lapsed
US
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Commutator-cylinder
Assignee: Westinghouse Electric Corp
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Filing: 1919-05-28
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Granted: 1921-12-27
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Expires: 1939-05-28
Abstract
No abstract record available.
Inventors
- 👤 Willard H Kempton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:47
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/04
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) | 1924-12-26 | 1925-06-27 | 1925-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-12-26 | 1929-06-27 | 1929-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-12-26 | 1933-06-27 | 1933-12-27 | $7700.00 | Window Closed / Lapsed |