US2665407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase-shift circuits
Assignee: Cutler Hammer Inc
•
Filing: 1950-12-26
•
Granted: 1954-01-05
•
Expires: 1970-12-26
Abstract
No abstract record available.
Inventors
- 👤 William H Elliot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:54
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/392; H05B41/3921
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1986622A
Cited
US2005893A
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US2030100A
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US2054496A
Cited
US2323427A
Cited
US2495158A
Cited
US2483090A
Cited
US2561080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |