US2481987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency signaling device
Assignee: Individual
•
Filing: 1944-11-29
•
Granted: 1949-09-13
•
Expires: 1964-11-29
Abstract
No abstract record available.
Inventors
- 👤 Dwyer Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:45
CPC Classifications
B; B63; B63B; B63B51/00; B63B51/04; F; F42; F42B; F42B4/00; F42B4/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-12 | 1953-03-14 | 1953-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-12 | 1957-03-14 | 1957-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-12 | 1961-03-14 | 1961-09-13 | $7700.00 | Window Closed / Lapsed |