Patent US3598122B1 successfully refreshed from Google Patents.
US2814724A
Expired / Lapsed
US
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Phase changing devices for electromagnetic waves
Assignee: Individual
•
Filing: 1954-01-25
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Granted: 1957-11-26
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Expires: 1974-01-25
Abstract
No abstract record available.
Inventors
- 👤 Culshaw William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:42
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/24; H01Q15/242; G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; H01P; H01P1/00; H01P1/165; H01P1/17; H01P1/18; H01P1/182; H01Q15/02
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) | 1960-11-25 | 1961-05-27 | 1961-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-25 | 1965-05-27 | 1965-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-25 | 1969-05-27 | 1969-11-26 | $7700.00 | Window Closed / Lapsed |