US2897442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency spectrum analyzers
Assignee: Marconis Wireless Telegraph Co Ltd
•
Filing: 1953-10-13
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Granted: 1959-07-28
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Expires: 1973-10-13
Abstract
No abstract record available.
Inventors
- 👤 Wright Peter Maurice
- 👤 Brandon Percy Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:48
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/30; H03H7/32; F; F02; F02K; F02K1/00; F02K1/06; F02K1/11; G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/26; G01S13/28; G01S13/32; G01S13/34; G01S13/343
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1994232A
Cited
US2159790A
Cited
US2530693A
Cited
US2425003A
Cited
US2403983A
Cited
US2602836A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |