US2673931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency antenna system
Assignee: Individual
•
Filing: 1950-03-21
•
Granted: 1954-03-30
•
Expires: 1970-03-21
Abstract
No abstract record available.
Inventors
- 👤 Robert H Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:28
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/28; H01Q9/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1158124A
Cited
US1855155A
Cited
US1960006A
Cited
US2147168A
Cited
US2242200A
Cited
US2361953A
Cited
US2480154A
Cited
US2513078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-29 | 1957-09-28 | 1958-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-29 | 1961-09-28 | 1962-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-29 | 1965-09-28 | 1966-03-30 | $7700.00 | Window Closed / Lapsed |