Patent US2462989A successfully refreshed from Google Patents.
Patent US5815380A successfully refreshed from Google Patents.
Patent US2667892A successfully refreshed from Google Patents.
US2667892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot controlled main valve for fluid pressure systems
Assignee: Individual
•
Filing: 1946-09-14
•
Granted: 1954-02-02
•
Expires: 1966-09-14
Abstract
No abstract record available.
Inventors
- 👤 Perry H Gentzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:30
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/10; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7738; Y10T137/7741; Y10T137/7742; Y10T137/7744; Y10T137/7745; Y10T137/7747; Y10T137/7758; Y10T137/7762; Y10T137/7769; Y10T137/7781; Y10T137/7832; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7923
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1924563A
Cited
US1951049A
Cited
US2059722A
Cited
US2047403A
Cited
US2180395A
Cited
US2287433A
Cited
US2278437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |