US2421591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra high frequency device of the cavity resonator type
Assignee: General Electric Co
•
Filing: 1943-05-13
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Granted: 1947-06-03
•
Expires: 1963-05-13
Abstract
No abstract record available.
Inventors
- 👤 Francis M Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:47
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2167201A
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US2169396A
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US2183215A
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US2287845A
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US2351895A
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US2278210A
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US2243537A
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US2284405A
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US2311520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |