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US2820173A
Expired / Lapsed
US
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Spectrum analyzer
Assignee: Individual
•
Filing: 1955-08-03
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Granted: 1958-01-14
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Expires: 1975-08-03
Abstract
No abstract record available.
Inventors
- 👤 Raabe Herbert Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:38
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/1921
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2179000A
Cited
US2243600A
Cited
US2360883A
Cited
US2495790A
Cited
US2410550A
Cited
US2557691A
Cited
US2718608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |