Patent US4504268A successfully refreshed from Google Patents.
US3136363A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure wellhead assembly
Assignee: Shell USA Inc
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Filing: 1961-05-02
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Granted: 1964-06-09
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Expires: 1981-05-02
Abstract
No abstract record available.
Inventors
- 👤 Edward D Yetman
- 👤 Lloyd G Otteman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:01
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
A WELLHEAD ASSEMBLY CONNECTING A PAIR OF TUBING STRINGS HANDLING HIGH PRESSURES WITHIN THE WELL TO A PAIR OF FLOWLINES HANDLING FLUIDS AT LOWER PRESSURES OUTSIDE THE WELL, SAID WELLHEAD ASSEMBLY COMPRISING A PAIR OF FLOW NIPPLES MOUNTED ON SAID WELLHEAD ASSEMBLY FORMING AT LEAST A PORTION OF THE FLOWLINES IN FLUID COMMUNICATION WITH A PAIR OF TUBING STRINGS WITHIN THE WELL, AT LEAST ONE OF SAID NIPPLES BEING SMOOTHLY-CURVED BRANCHING UPWARDLY AND OUTWARDLY, EACH OF SAID NIPPLES HAVING A CHOKE LANDINGK SURFACE IN THE BORE THEREOF FOR SEATING A CHOKE THEREIN, WELL CONTROL MASTER VALVE MEANS CARRIED BY SAID WELLHEAD ASSEMBLY ON THE WELL SIDE OF SAID NIPPLES FOR CONTROLLING THE WELL FLUID FLOW THERETHROUGH, SECOND VALVE MEANS AT THE OTHER ENDS OF SAID NIPPLES, BYPASS CONDUIT MEANS IN FLUID FLOW COMMUNICATION WITH EACH NIPPLE AROUND THE CHOKE LANDING SURFACE THEREOF, A PAIR OF SPACED VALVE MEANS IN EACH OF SAID BYPASS CONDUIT MEANS, AND CROSSOVER CONDUIT MEANS IN COMMUNICATION WITH AND BETWEEN SAID TWO BYPASS CONDUIT MEANS AT A POINT BETWEEN THE PAIRS OF VALVE MEANS THEREIN.
Claim 2
Dependent Claim
179 words
A WELLHEAD ASSEMBLY CONNECTING A PAIR OF TUBING STRINGS HANDLING HIGH PRESSURES WITHIN THE WELL TO A PAIR OF FLOWLINES HANDLING FLUIDS AT LOWER PRESSURES OUTSIDE THE WELL, SAID WELLHEAD ASSEMBLY COMPRISING A PAIR OF FLOW NIPPLES MOUNTED ON SAID WELLHEAD ASSEMBLY FORMING AT LEAST A PORTION OF THE FLOWLINES IN FLUID COMMUNICATION WITH A PAIR OF TUBING STRINGS WITHIN THE WELL, AT LEAST ONE OF SAID NIPPLES BEING SMOOTHLY-CURVED BRANCHING UPWARDLY AND OUTWARDLY, EACH OF SAID NIPPLES HAVING A CHOKE LANDINGK SURFACE IN THE BORE THEREOF FOR SEATING A CHOKE THEREIN, WELL CONTROL MASTER VALVE MEANS CARRIED BY SAID WELLHEAD ASSEMBLY ON THE WELL SIDE OF SAID NIPPLES FOR CONTROLLING THE WELL FLUID FLOW THERETHROUGH, SECOND VALVE MEANS AT THE OTHER ENDS OF SAID NIPPLES, BYPASS CONDUIT MEANS IN FLUID FLOW COMMUNICATION WITH EACH NIPPLE AROUND THE CHOKE LANDING SURFACE THEREOF, A PAIR OF SPACED VALVE MEANS IN EACH OF SAID BYPASS CONDUIT MEANS, AND CROSSOVER CONDUIT MEANS IN COMMUNICATION WITH AND BETWEEN SAID TWO BYPASS CONDUIT MEANS AT A POINT BETWEEN THE PAIRS OF VALVE MEANS THEREIN.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |