Patent US2354684A successfully refreshed from Google Patents.
US2354684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siren
Assignee: AT&T Inc
•
Filing: 1942-08-20
•
Granted: 1944-08-01
•
Expires: 1962-08-20
Abstract
No abstract record available.
Inventors
- 👤 Robert C Jones
- 👤 Horace T O'neil
- 👤 Edward C Wente
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:49
CPC Classifications
G; G10; G10K; G10K7/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-08-01 | 1948-01-31 | 1948-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-08-01 | 1952-01-31 | 1952-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-08-01 | 1956-01-31 | 1956-08-01 | $7700.00 | Window Closed / Lapsed |