US2993204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-band helical antenna
Assignee: TDK Micronas GmbH
•
Filing: 1958-02-28
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Granted: 1961-07-18
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Expires: 1978-02-28
Abstract
No abstract record available.
Inventors
- 👤 William W Macalpine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:20
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/06; H01Q9/14; H01Q1/00; H01Q1/36; H01Q1/362; H01Q5/00; H01Q5/30; H01Q5/307; H01Q5/342; H01Q5/357
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1911980A
Cited
US2125804A
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US2311472A
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US2855599A
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US2866197A
Cited
US2781514A
Cited
US2875443A
Cited
US2854667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |