Patent US2438680A successfully refreshed from Google Patents.
US2438680A
Expired / Lapsed
US
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Loop antenna apparatus
Assignee: Individual
•
Filing: 1944-10-20
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Granted: 1948-03-30
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Expires: 1964-10-20
Abstract
No abstract record available.
Inventors
- 👤 Wladimir J Polydoroff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:20
CPC Classifications
H; H01; H01Q; H01Q7/00; H01Q7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1077319A
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US1942575A
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US1655931A
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GB517982A
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US2266262A
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US2343306A
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US2339234A
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US2316623A
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US2328024A
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US2354332A
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US2375418A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-30 | 1951-09-29 | 1952-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-30 | 1955-09-29 | 1956-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-30 | 1959-09-29 | 1960-03-30 | $7700.00 | Window Closed / Lapsed |