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Patent US3431405A successfully refreshed from Google Patents.
US3431405A
Expired / Lapsed
US
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Spectrum analyzer
Assignee: United States Department of the Air Force
•
Filing: 1965-02-16
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Granted: 1969-03-04
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Expires: 1985-02-16
Abstract
No abstract record available.
Inventors
- 👤 Edward C Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:56
CPC Classifications
H; H03; H03H; H03H17/00; H03H17/02; G; G01; G01R; G01R23/00; G06; G06F; G06F17/00; G06F17/10; G06F17/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2923475A
Cited
US3090044A
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US3036775A
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US3145293A
Cited
US3226534A
Cited
US3188453A
Cited
US3167738A
Cited
US3303335A
Cited
US3333091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-03 | 1972-09-02 | 1973-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-03 | 1976-09-02 | 1977-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-03 | 1980-09-02 | 1981-03-04 | $7700.00 | Window Closed / Lapsed |