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Patent US2780685A successfully refreshed from Google Patents.
US2780685A
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Interlocking mechanism
Assignee: Westinghouse Electric Corp
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Filing: 1953-08-11
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Granted: 1957-02-05
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Expires: 1973-08-11
Abstract
No abstract record available.
Inventors
- 👤 James H Sprow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:24
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/20; H01H9/22; H01H9/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1306345A
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US1306347A
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DE420453C
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US1349818A
Cited
US1741227A
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DE681945C
Cited
US2328801A
Cited
US2612789A
Cited
US2604796A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |