Patent US2618744A successfully refreshed from Google Patents.
US2618744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulation radar systems with directional couplers or the like
Assignee: RCA Corp
•
Filing: 1949-04-30
•
Granted: 1952-11-18
•
Expires: 1969-04-30
Abstract
No abstract record available.
Inventors
- 👤 Rene A Braden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:09
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12; H01P5/16; H01P5/18; G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2491540A
Cited
US2445895A
Cited
US2408791A
Cited
US2460781A
Cited
US2424796A
Cited
US2445445A
Cited
US2475474A
Cited
US2493801A
Cited
US2462841A
Cited
US2477428A
Cited
US2475176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |