Patent US2429640A successfully refreshed from Google Patents.
US2429640A
Expired / Lapsed
US
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Directive antenna
Assignee: Sperry Gyroscope Co Inc
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Filing: 1942-10-17
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Granted: 1947-10-28
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Expires: 1962-10-17
Abstract
No abstract record available.
Inventors
- 👤 Walter W Mieher
- 👤 John D Mallett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:17
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/02; H01P5/022; H01P5/024; H01Q; H01Q19/00; H01Q19/10; H01Q19/12; H01Q19/13; H01Q19/134
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) | 1950-10-27 | 1951-04-28 | 1951-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-27 | 1955-04-28 | 1955-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-27 | 1959-04-28 | 1959-10-28 | $7700.00 | Window Closed / Lapsed |