US2954428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuits for providing a variable bias potential
Assignee: Creed and Co Ltd
•
Filing: 1955-03-23
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Granted: 1960-09-27
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Expires: 1975-03-23
Abstract
No abstract record available.
Inventors
- 👤 Mason Frederick Percival
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:55
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/12; H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/066; H04; H04B; H04B15/00; H04B15/02; H04N; H04N1/00; H04N1/40; H04N1/40056; H04N1/407
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-27 | 1964-03-28 | 1964-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-27 | 1968-03-28 | 1968-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-27 | 1972-03-28 | 1972-09-27 | $7700.00 | Window Closed / Lapsed |