US2780950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control system
Assignee: Phillips Petroleum Co
•
Filing: 1954-09-17
•
Granted: 1957-02-12
•
Expires: 1974-09-17
Abstract
No abstract record available.
Inventors
- 👤 John H Province
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:01
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/16; F; F15; F15B; F15B21/00; F16; F16C; F16C33/00; F16C33/72; F16C33/76; F16C33/78; F16D; F16D43/00; F16D43/28; F16D43/284; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/38
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1126124A
Cited
US1846578A
Cited
US2398087A
Cited
US2578686A
Cited
US2550045A
Cited
US2544639A
Cited
US2450934A
Cited
US2556536A
Cited
US2703221A
Cited
US2615681A
Cited
US2639894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-12 | 1960-08-13 | 1961-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-12 | 1964-08-13 | 1965-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-12 | 1968-08-13 | 1969-02-12 | $7700.00 | Window Closed / Lapsed |