US2521798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna
Assignee: Individual
•
Filing: 1948-06-15
•
Granted: 1950-09-12
•
Expires: 1968-06-15
Abstract
No abstract record available.
Inventors
- 👤 Ralph N Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:55
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US64129A
Cited
US429022A
Cited
GB215151A
Cited
US1697866A
Cited
GB495019A
Cited
US2175363A
Cited
US2249416A
Cited
US2259628A
Cited
US2299218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |