US2421028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave reflection aircraft detector using rotating polarization
Assignee: AT&T Inc
•
Filing: 1942-11-24
•
Granted: 1947-05-27
•
Expires: 1962-11-24
Abstract
No abstract record available.
Inventors
- 👤 Archie P King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:00
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/282
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1828705A
Cited
US1915784A
Cited
US1993326A
Cited
US2227598A
Cited
US2189549A
Cited
US2198113A
Cited
US2272839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-26 | 1950-11-25 | 1951-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-26 | 1954-11-25 | 1955-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-26 | 1958-11-25 | 1959-05-27 | $7700.00 | Window Closed / Lapsed |