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US2489697A
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Transformer control circuit
Assignee: THOMSON ELECTRIC WELDER CO
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Filing: 1946-07-10
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Granted: 1949-11-29
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Expires: 1966-07-10
Abstract
No abstract record available.
Inventors
- 👤 Jr Francis L Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:00
CPC Classifications
B; B23; B23K; B23K11/00; B23K11/24; B23K11/248
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US740174A
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US1291078A
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US1550906A
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US1916012A
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US1831886A
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US1896397A
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US2067153A
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US2233617A
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US2214868A
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US2399453A
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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) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |