US2720588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio antennae
Assignee: National Research Development Corp UK
•
Filing: 1950-07-07
•
Granted: 1955-10-11
•
Expires: 1970-07-07
Abstract
No abstract record available.
Inventors
- 👤 Jones Spencer Selth Duniam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:56
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2469419A
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US2504333A
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US2526675A
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GB603449A
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US2478241A
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GB605344A
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US2650985A
Cited
US2562277A
Cited
US2596190A
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US2576181A
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US2576182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |