US2588520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically operated check valve mechanism
Assignee: Minneapolis Moline Co
•
Filing: 1946-10-12
•
Granted: 1952-03-11
•
Expires: 1966-10-12
Abstract
No abstract record available.
Inventors
- 👤 Henry A Halgren
- 👤 Victor N Albertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:11
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/01; F15B15/00; F15B15/08; F15B15/14; F15B15/149
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US845827A
Cited
US1590226A
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US1877102A
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US1799366A
Cited
US1955154A
Cited
US2051906A
Cited
US2246461A
Cited
US2359949A
Cited
US2368659A
Cited
US2410978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-11 | 1955-09-10 | 1956-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-11 | 1959-09-10 | 1960-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-11 | 1963-09-10 | 1964-03-11 | $7700.00 | Window Closed / Lapsed |