US2491098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polar biased relay
Assignee: SPX Technologies Inc
•
Filing: 1945-04-17
•
Granted: 1949-12-13
•
Expires: 1965-04-17
Abstract
No abstract record available.
Inventors
- 👤 Oscar S Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:43
CPC Classifications
H; H01; H01H; H01H51/00; H01H51/22; H01H51/2272
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |