Patent US1899746A successfully refreshed from Google Patents.
US1899746A
Expired / Lapsed
US
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Protective system for transformers
Assignee: Westinghouse Electric Corp
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Filing: 1929-04-03
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Granted: 1933-02-28
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Expires: 1949-04-03
Abstract
No abstract record available.
Inventors
- 👤 Roy L Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:21
CPC Classifications
H; H02; H02H; H02H5/00; H02H5/08; H01; H01F; H01F27/00; H01F27/40; H01F27/402; H01F27/404; H01F27/08; H01F27/10; H01F27/12; H01F27/14; H01H; H01H33/00; H01H33/02; H01H33/53; H01H33/55; H01H33/555; H01H35/00; H01H35/24; H01H35/32
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) | 1936-02-28 | 1936-08-29 | 1937-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-02-28 | 1940-08-29 | 1941-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-02-28 | 1944-08-29 | 1945-02-28 | $7700.00 | Window Closed / Lapsed |