Patent US2489221A successfully refreshed from Google Patents.
US2489221A
Expired / Lapsed
US
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Craft locating apparatus
Assignee: LAFAYETTE M HUGHES
•
Filing: 1945-06-26
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Granted: 1949-11-22
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Expires: 1965-06-26
Abstract
No abstract record available.
Inventors
- 👤 Robert J Herbold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:43
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1387850A
Cited
US1149122A
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US1936400A
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US1954329A
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US2147156A
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US2077398A
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US2220181A
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US2366939A
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US2188293A
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US2216716A
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US2206036A
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US2234329A
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US2350820A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |