US2247493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mercury contact relay
Assignee: AT&T Inc
•
Filing: 1939-11-02
•
Granted: 1941-07-01
•
Expires: 1959-11-02
Abstract
No abstract record available.
Inventors
- 👤 Henry C Harrison
- 👤 Charles E Pollard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:00
CPC Classifications
H; H01; H01H; H01H29/00; H01H29/18; H01H51/00; H01H51/28; H01H51/287
Claims Analysis
Total Claims: 0
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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) | 1944-06-30 | 1944-12-30 | 1945-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-06-30 | 1948-12-30 | 1949-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-06-30 | 1952-12-30 | 1953-07-01 | $7700.00 | Window Closed / Lapsed |