Patent US1691349A successfully refreshed from Google Patents.
US1691349A
Expired / Lapsed
US
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High-frequency induction furnace
Assignee: Westinghouse Electric Corp
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Filing: 1927-06-01
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Granted: 1928-11-13
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Expires: 1947-06-01
Abstract
No abstract record available.
Inventors
- 👤 George F Harrington
- 👤 Porter H Brace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:42
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; F; F27; F27D; F27D11/00; F27D11/06; H; H05; H05B; H05B6/00; H05B6/02; H05B6/36; H05B6/44
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) | 1931-11-13 | 1932-05-14 | 1932-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-11-13 | 1936-05-14 | 1936-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-11-13 | 1940-05-14 | 1940-11-13 | $7700.00 | Window Closed / Lapsed |