US2158293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure relief means for oil circuit breaker tanks
Assignee: Westinghouse Electric Corp
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Filing: 1937-10-09
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Granted: 1939-05-16
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Expires: 1957-10-09
Abstract
No abstract record available.
Inventors
- 👤 Harry J Lingal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:45
CPC Classifications
A; A62; A62C; A62C99/00; A62C99/009; H; H01; H01H; H01H33/00; H01H33/02; H01H33/53; H01H33/55; H01H33/56; H01H2033/568; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7907
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) | 1942-05-15 | 1942-11-14 | 1943-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-05-15 | 1946-11-14 | 1947-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-05-15 | 1950-11-14 | 1951-05-16 | $7700.00 | Window Closed / Lapsed |