Patent US3017574A successfully refreshed from Google Patents.
US3017574A
Expired / Lapsed
US
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Electrical phase shifter
Assignee: Individual
•
Filing: 1959-03-24
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Granted: 1962-01-16
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Expires: 1979-03-24
Abstract
No abstract record available.
Inventors
- 👤 John T Redfern
- 👤 George M Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:40
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)
US1495466A
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GB451786A
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US2241615A
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US2432778A
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US2429636A
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US2471105A
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US2394892A
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US2517805A
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US2762012A
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US2902650A
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US2711508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-15 | 1965-07-17 | 1966-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-15 | 1969-07-17 | 1970-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-15 | 1973-07-17 | 1974-01-16 | $7700.00 | Window Closed / Lapsed |