US2415991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable signaling device
Assignee: Individual
•
Filing: 1944-02-04
•
Granted: 1947-02-18
•
Expires: 1964-02-04
Abstract
No abstract record available.
Inventors
- 👤 Charles L Christian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:27
CPC Classifications
F; F21; F21V; F21V33/00; F21L; F21L2/00; G; G08; G08B; G08B5/00; G08B5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US723845A
Cited
US1149933A
Cited
US1622196A
Cited
US1883546A
Cited
US2114460A
Cited
US2339471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-02-17 | 1950-08-19 | 1951-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-17 | 1954-08-19 | 1955-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-17 | 1958-08-19 | 1959-02-18 | $7700.00 | Window Closed / Lapsed |