Patent US2804618A successfully refreshed from Google Patents.
US2804618A
Expired / Lapsed
US
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Interference eliminating antenna system
Assignee: JFD Manufacturing CO Inc
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Filing: 1955-03-21
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Granted: 1957-08-27
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Expires: 1975-03-21
Abstract
No abstract record available.
Inventors
- 👤 Douglas H Carpenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:31
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2117680A
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US2051260A
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US2307184A
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US2226836A
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US2407659A
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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) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |