US2541627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wireless signaling system
Assignee: Individual
•
Filing: 1947-07-25
•
Granted: 1951-02-13
•
Expires: 1967-07-25
Abstract
No abstract record available.
Inventors
- 👤 Williams Frederic Calland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:27
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR578335A
Cited
US1615712A
Cited
FR700525A
Cited
US2144203A
Cited
US2403626A
Cited
US2408773A
Cited
US2408048A
Cited
US2419525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |