Patent US2521475A successfully refreshed from Google Patents.
US2919441A
Expired / Lapsed
US
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Radio-frequency-energy transmission line and antenna
Assignee: Individual
•
Filing: 1955-04-15
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Granted: 1959-12-29
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Expires: 1975-04-15
Abstract
No abstract record available.
Inventors
- 👤 Chu Lan Jen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:59
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/02; H01P3/08; H01P3/085; H01Q; H01Q13/00; H01Q13/20; H01Q13/26; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2556224A
Cited
GB655803A
Cited
US2721312A
Cited
US2800634A
Cited
US2819452A
Cited
US2794185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-28 | 1963-06-29 | 1963-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-28 | 1967-06-29 | 1967-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-28 | 1971-06-29 | 1971-12-29 | $7700.00 | Window Closed / Lapsed |