Patent US2552489A successfully refreshed from Google Patents.
US2552489A
Expired / Lapsed
US
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Method and apparatus for adjusting radio echo detection systems
Assignee: Individual
•
Filing: 1943-06-24
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Granted: 1951-05-08
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Expires: 1963-06-24
Abstract
No abstract record available.
Inventors
- 👤 James L Lawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:23
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB358917A
Cited
US1927393A
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US2036164A
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US2281274A
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US2129669A
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US2301160A
Cited
US2401717A
Cited
US2213104A
Cited
US2400796A
Cited
US2424156A
Cited
US2439656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |