US2639693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control valve and system
Assignee: M O JOHNSTON
•
Filing: 1949-04-23
•
Granted: 1953-05-26
•
Expires: 1969-04-23
Abstract
No abstract record available.
Inventors
- 👤 Raymond S Miller
- 👤 George W Sinclair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:55
CPC Classifications
F; F16; F16K; F16K39/00; F16K39/02; F16K39/024; F15; F15B; F15B11/00; F15B11/08; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/20507; F15B2211/20523; F15B2211/255; F15B2211/275; F15B2211/30; F15B2211/305; F15B2211/3056; F15B2211/30565; F15B2211/30575; F15B2211/315; F15B2211/31523; F15B2211/31529; F15B2211/3157; F15B2211/31576; F15B2211/32; F15B2211/321; F15B2211/329; F15B2211/60; F15B2211/635; F15B2211/6355; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87193; Y10T137/87201; Y10T137/87233; Y10T137/87241
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) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |