US2441877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beacon system
Assignee: Individual
•
Filing: 1943-06-04
•
Granted: 1948-05-18
•
Expires: 1963-06-04
Abstract
No abstract record available.
Inventors
- 👤 William J Flett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:14
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/18; B64F1/20; 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)
USRE21838E
Cited
US1343899A
Cited
DE426699C
Cited
US1349277A
Cited
US1235065A
Cited
US1279638A
Cited
US1598044A
Cited
US1846208A
Cited
US1989295A
Cited
GB393501A
Cited
US2023708A
Cited
US2386268A
Cited
US2273951A
Cited
US2238409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-18 | 1951-11-17 | 1952-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-18 | 1955-11-17 | 1956-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-18 | 1959-11-17 | 1960-05-18 | $7700.00 | Window Closed / Lapsed |