US2490821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for testing fluid operated switches
Assignee: Individual
•
Filing: 1947-10-10
•
Granted: 1949-12-13
•
Expires: 1967-10-10
Abstract
No abstract record available.
Inventors
- 👤 George H Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:43
CPC Classifications
F; F42; F42C; F42C21/00; H; H01; H01H; H01H11/00; H01H11/0062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1905668A
Cited
US2026079A
Cited
US2310974A
Cited
US2354562A
Cited
US2332725A
Cited
US2364709A
Cited
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 |