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Patent US3447112A successfully refreshed from Google Patents.
US3447112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cooled transformer
Assignee: Westinghouse Electric Corp
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Filing: 1967-11-16
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Granted: 1969-05-27
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Expires: 1987-11-16
Abstract
No abstract record available.
Inventors
- 👤 Alvin Y Broverman
- 👤 Garlington C Wilburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:39
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/30; H01F27/306; H01F27/08; H01F27/085; H01F27/32; H01F27/327; H01F2027/328
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1317280A
Cited
US949082A
Cited
US1411619A
Cited
US1608891A
Cited
US2014540A
Cited
US3386060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |