Patent US3974792A successfully refreshed from Google Patents.
US2777024A
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Metal-enclosed switchgear
Assignee: Westinghouse Electric Corp
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Filing: 1951-04-28
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Granted: 1957-01-08
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Expires: 1971-04-28
Abstract
No abstract record available.
Inventors
- 👤 Charles P West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:38
CPC Classifications
H; H02; H02B; H02B11/00; H02B11/12; H02B11/127; H02B11/133; H02B11/02; H02B11/10; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20207; Y10T74/20238
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2129723A
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US2273002A
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US2388934A
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US2376471A
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US2443664A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |