US2985774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarity sensing amplifier circuit
Assignee: Westinghouse Electric Corp
•
Filing: 1959-08-27
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Granted: 1961-05-23
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Expires: 1979-08-27
Abstract
No abstract record available.
Inventors
- 👤 Victor T Carbone
- 👤 Jr Russell D Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:41
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2698392A
Cited
GB764154A
Cited
US2907932A
Cited
US2877357A
Cited
US2840727A
Cited
US2809303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |