US2590769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back-pressure valve for hydraulic machine tools
Assignee: Rockford Machine Tool Co
•
Filing: 1943-08-30
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Granted: 1952-03-25
•
Expires: 1963-08-30
Abstract
No abstract record available.
Inventors
- 👤 Rudolph E Herrstrum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:20
CPC Classifications
B; B23; B23Q; B23Q5/00; B23Q5/02; B23Q5/027; B23Q5/033; F; F16; F16K; F16K15/00; F16K15/02; F16K15/06; F16K15/063; F16K31/00; F16K31/12; F16K31/122; F16K47/00; F16K47/01; F16K47/011; F16K2200/00; F16K2200/30; F16K2200/305; F16K2200/3053; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/778; Y10T137/7781; Y10T137/7837; Y10T137/785; Y10T137/7904
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) | 1955-03-25 | 1955-09-24 | 1956-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-25 | 1959-09-24 | 1960-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-25 | 1963-09-24 | 1964-03-25 | $7700.00 | Window Closed / Lapsed |