Patent US2769875A successfully refreshed from Google Patents.
US2769875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercury contact switch
Assignee: AT&T Inc
•
Filing: 1953-09-25
•
Granted: 1956-11-06
•
Expires: 1973-09-25
Abstract
No abstract record available.
Inventors
- 👤 John T L Brown
- 👤 Jr Charles E Pollard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:37
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/06; H01H1/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2406036A
Cited
US2445406A
Cited
US2508508A
Cited
US2646613A
Cited
US2609464A
Cited
US2625737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |