Patent US2835890A successfully refreshed from Google Patents.
US2835890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional antenna
Assignee: Individual
•
Filing: 1951-10-10
•
Granted: 1958-05-20
•
Expires: 1971-10-10
Abstract
No abstract record available.
Inventors
- 👤 Burt J Bittner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:49
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/22; H01Q3/00; H01Q3/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1805591A
Cited
DE668231C
Cited
US2223950A
Cited
US2532919A
Cited
US2510020A
Cited
US2622199A
Cited
US2608656A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |