US2508508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercury contact for electrical switches
Assignee: AT&T Inc
•
Filing: 1946-08-10
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Granted: 1950-05-23
•
Expires: 1966-08-10
Abstract
No abstract record available.
Inventors
- 👤 John S Garvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:54
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/16; H01H50/36; H01H51/00; H01H51/28; H01H51/288
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) | 1953-05-22 | 1953-11-21 | 1954-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-22 | 1957-11-21 | 1958-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-22 | 1961-11-21 | 1962-05-23 | $7700.00 | Window Closed / Lapsed |