US2524334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for electromagnets
Assignee: Individual
•
Filing: 1944-11-28
•
Granted: 1950-10-03
•
Expires: 1964-11-28
Abstract
No abstract record available.
Inventors
- 👤 Sr William H Pumphrey
- 👤 Cornell Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:01
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/18; H01F7/1805; H01F7/121; H01F7/123
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1843966A
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US2069578A
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US1979127A
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US2140386A
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US2352985A
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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) | 1953-10-02 | 1954-04-03 | 1954-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-02 | 1958-04-03 | 1958-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-02 | 1962-04-03 | 1962-10-03 | $7700.00 | Window Closed / Lapsed |