US2472158A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio beacon system
Assignee: AT&T Inc
•
Filing: 1940-07-26
•
Granted: 1949-06-07
•
Expires: 1960-07-26
Abstract
No abstract record available.
Inventors
- 👤 Henry James Matthew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:04
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1732741A
Cited
US2014732A
Cited
US2138894A
Cited
FR811700A
Cited
US2183562A
Cited
US2229078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-06 | 1952-12-06 | 1953-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-06 | 1956-12-06 | 1957-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-06 | 1960-12-06 | 1961-06-07 | $7700.00 | Window Closed / Lapsed |