Patent US3951549A successfully refreshed from Google Patents.
US2452586A
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Phase shift circuits
Assignee: Unisys Corp
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Filing: 1944-03-23
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Granted: 1948-11-02
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Expires: 1964-03-23
Abstract
No abstract record available.
Inventors
- 👤 Rawley D Mccoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:32
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/16; H03H11/20; G; G01; G01R; G01R25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1946274A
Cited
US1972535A
Cited
US2024489A
Cited
US2155210A
Cited
US2207511A
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GB489849A
Cited
US2254734A
Cited
US2236985A
Cited
US2354799A
Cited
US2285038A
Cited
US2340429A
Cited
GB555771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-02 | 1952-05-03 | 1952-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-02 | 1956-05-03 | 1956-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-02 | 1960-05-03 | 1960-11-02 | $7700.00 | Window Closed / Lapsed |