US2823381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna
Assignee: Individual
•
Filing: 1952-01-18
•
Granted: 1958-02-11
•
Expires: 1972-01-18
Abstract
No abstract record available.
Inventors
- 👤 John F P Martin
- 👤 Louis H Kellogg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:15
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/24; H01Q21/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1933941A
Cited
US2105569A
Cited
US2297329A
Cited
US2420967A
Cited
US2480182A
Cited
US2512682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |