Patent US2791569A successfully refreshed from Google Patents.
Patent US1973838A successfully refreshed from Google Patents.
Patent US2479568A successfully refreshed from Google Patents.
US2479568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doppler radar system
Assignee: Unisys Corp
•
Filing: 1943-08-19
•
Granted: 1949-08-23
•
Expires: 1963-08-19
Abstract
No abstract record available.
Inventors
- 👤 William W Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:22
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/522; G01S13/524; G01S13/53; G01S13/06; G01S13/08; G01S13/32; G01S13/36
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1639667A
Cited
US1750668A
Cited
US2055883A
Cited
US2134716A
Cited
US2406316A
Cited
US2248727A
Cited
US2236893A
Cited
US2301929A
Cited
US2402464A
Cited
US2424263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-22 | 1953-02-21 | 1953-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-22 | 1957-02-21 | 1957-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-22 | 1961-02-21 | 1961-08-23 | $7700.00 | Window Closed / Lapsed |