US2677030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic control system
Assignee: Individual
•
Filing: 1947-10-03
•
Granted: 1954-04-27
•
Expires: 1967-10-03
Abstract
No abstract record available.
Inventors
- 👤 Frey Hans Jakob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:25
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/64; H01H50/66; H05; H05B; H05B31/00; H05B31/02; H05B31/18; H05B31/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US905782A
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US760658A
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US1001400A
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US1986032A
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DE668041C
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US2037572A
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US2121179A
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US2215067A
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US2298073A
Cited
US2358633A
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US2489098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |