US2899647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency selector of microwaves
Assignee: —
•
Filing: —
•
Granted: 1959-08-11
•
Expires: 1976-08-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:58
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/54; H01; H01P; H01P1/00; H01P1/16; H01P1/162
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2253589A
Cited
US2404261A
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US2660667A
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US2633493A
Cited
US2514779A
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US2555349A
Cited
US2677111A
Cited
US2682641A
Cited
US2644889A
Cited
US2556881A
Cited
US2788497A
Cited
US2788494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |