US3219117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling and production apparatus and method
Assignee: Richfield Oil Corp
•
Filing: 1961-07-10
•
Granted: 1965-11-23
•
Expires: 1981-07-10
Abstract
No abstract record available.
Inventors
- 👤 Robert D Johnstone
- 👤 David C Kofahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:45
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B7/00; E21B7/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
83 words
AN UNDERWATER PRODUCTION HEAD FOR CONTROLLING THE FLOW OF FLUIDS INTO FLOW LINES FROM A WELL DRILLED FROM A FLOATING VESSEL INTO A FORMATION UNDERLYING A BODY OF WATER, COMPRISING IN COMBINATION: A PRODUCTION MANDREL HAVING A BORE, A TUBING OUTLET AND AN ANNULUS OUTLET, SAID TUBING OUTLET BEING IN FLUID COMMUNICATION WITH THE BORE OF SAID MANDREL, TUBING HANGER MEANS BELOW SAID TUBING OUTLET, WELL PRODUCTION TUBING, A REMOVABLE PRODUCTION BLOCK POSITIONED ON SAID PRODUCTION MANDREL, SAID BLOCK HAVING MEANS FOR PASS-
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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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |