US2641738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric regulator responsive to phase difference of two currents
Assignee: Allis Chalmers Corp
•
Filing: 1951-01-20
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Granted: 1953-06-09
•
Expires: 1971-01-20
Abstract
No abstract record available.
Inventors
- 👤 Daniel J Sikorra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:13
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/16; H02P9/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1841082A
Cited
US2399872A
Cited
US2414569A
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US2477728A
Cited
US2473791A
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US2504909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |