Patent US2551180A successfully refreshed from Google Patents.
US2551180A
Expired / Lapsed
US
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Radio echo system
Assignee: Individual
•
Filing: 1947-07-29
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Granted: 1951-05-01
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Expires: 1967-07-29
Abstract
No abstract record available.
Inventors
- 👤 Starr Arthur Tisso
- 👤 Hay Victor John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:53
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/18; Y; Y10; Y10T; Y10T74/00; Y10T74/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1311509A
Cited
US1733531A
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US2369622A
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US2415679A
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US2415680A
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US2410827A
Cited
US2425737A
Cited
US2407275A
Cited
US2472824A
Cited
US2475746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |