US2501292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid contactor
Assignee: Joy Manufacturing Co
•
Filing: 1945-11-28
•
Granted: 1950-03-21
•
Expires: 1965-11-28
Abstract
No abstract record available.
Inventors
- 👤 John D Russell
- 👤 James W Woolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:25
CPC Classifications
H; H01; H01H; H01H29/00; H01H29/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US638186A
Cited
US963208A
Cited
US1228058A
Cited
DE443289C
Cited
US1915462A
Cited
US2393904A
Cited
US2288090A
Cited
US2266469A
Cited
US2402739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |