Patent US2634409A successfully refreshed from Google Patents.
US2634409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric signaling device
Assignee: Individual
•
Filing: 1949-09-01
•
Granted: 1953-04-07
•
Expires: 1969-09-01
Abstract
No abstract record available.
Inventors
- 👤 Walcher Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:40
CPC Classifications
G; G10; G10K; G10K1/00; G10K1/06; G10K1/08; G10K1/26; G10K1/062; G10K1/063
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |