US2539090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetically operated device
Assignee: Individual
•
Filing: 1948-05-18
•
Granted: 1951-01-23
•
Expires: 1968-05-18
Abstract
No abstract record available.
Inventors
- 👤 George H Leland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:29
CPC Classifications
H; H01; H01H; H01H50/00; H01H50/16; H01H50/18; H01H50/20; Y; Y10; Y10S; Y10S74/00; Y10S74/04; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18088; Y10T74/18888; Y10T74/18984
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE659975C
Cited
US1138738A
Cited
US1292267A
Cited
US1802459A
Cited
US2009964A
Cited
US2110033A
Cited
US2227328A
Cited
US2446138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |