Patent US4894825A successfully refreshed from Google Patents.
Patent US2665381A successfully refreshed from Google Patents.
US2665381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slotted cylindrical antenna
Assignee: SMITH
•
Filing: 1947-10-16
•
Granted: 1954-01-05
•
Expires: 1967-10-16
Abstract
No abstract record available.
Inventors
- 👤 Carl E Smith
- 👤 Sinclair George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:30
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/10; H01Q13/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2129712A
Cited
US2158376A
Cited
US2415094A
Cited
US2238770A
Cited
US2250096A
Cited
US2234293A
Cited
US2404196A
Cited
US2405242A
Cited
US2414266A
Cited
US2385783A
Cited
US2488419A
Cited
US2511029A
Cited
US2417895A
Cited
US2557951A
Cited
US2549783A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |