Patent US3168337A successfully refreshed from Google Patents.
US3168337A
Expired / Lapsed
US
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Wellhead assembly
Assignee: Shell USA Inc
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Filing: 1960-11-28
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Granted: 1965-02-02
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Expires: 1980-11-28
Abstract
No abstract record available.
Inventors
- 👤 Glenn D Johnson
- 👤 Bruce J Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:53
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A WELLHEAD ASSEMBLY FOR SUPPORTING A CASING STRING AND A TUBING STRING DISPOSED WITHIN SAID CASING STRING, BOTH OF SAID STRINGS EXTENDING INTO A WELL BORE AND DEPENDING FROM SAID WELLHEAD ASSEMBLY, SAID WELLHEAD ASSEMBLY COMPRISING A HOUSING MEMBER HAVING AN OPEN UPPER END, LANDING SURFACE MEANS FORMED IN SAID HOUSING MEMBER FOR SUPPORTING A TUBING HANGER HTEREON WITH A TUBING STRING DEPENDING FROM SAID TUBING HANGER, CLOSURE MEANS RELEASABLY CONNECTIBLE TO SAID HOUSING MEMBER FOR CLOSING THE UPPER END THEREOF, FIRST PASSAGEWAY MEANS DEFINED BY SAID WELLHEAD ASSEMBLY AND EXTENDING THROUGH SAID CLOSURE MEANS IN COMMUNICATION BETWEEN SAID TUBING STRING DEPENDING WITHIN SAID HOUSING MEMBER AND THE SPACE ABOVE SAID CLOSURE MEANS, PORTIONS OF SAID FIRST PASSAGEWAY MEANS BEING DEFINED BY SEPARABLE PORTIONS OF SAID WELLHEAD ASSEMBLY, FIRST CONDUIT MEANS FORMING A PORTION OF SAID SEPARABLE PORTIONS OF SAID WELLHEAD ASSEMBLY DEFINING SAID FIRST PASSAGEWAY MEANS, A CONNECTOR MEANS CARRIED ON ONE END OF SAID FIRST CON-
Claim 2
Dependent Claim
158 words
A WELLHEAD ASSEMBLY FOR SUPPORTING A CASING STRING AND A TUBING STRING DISPOSED WITHIN SAID CASING STRING, BOTH OF SAID STRINGS EXTENDING INTO A WELL BORE AND DEPENDING FROM SAID WELLHEAD ASSEMBLY, SAID WELLHEAD ASSEMBLY COMPRISING A HOUSING MEMBER HAVING AN OPEN UPPER END, LANDING SURFACE MEANS FORMED IN SAID HOUSING MEMBER FOR SUPPORTING A TUBING HANGER HTEREON WITH A TUBING STRING DEPENDING FROM SAID TUBING HANGER, CLOSURE MEANS RELEASABLY CONNECTIBLE TO SAID HOUSING MEMBER FOR CLOSING THE UPPER END THEREOF, FIRST PASSAGEWAY MEANS DEFINED BY SAID WELLHEAD ASSEMBLY AND EXTENDING THROUGH SAID CLOSURE MEANS IN COMMUNICATION BETWEEN SAID TUBING STRING DEPENDING WITHIN SAID HOUSING MEMBER AND THE SPACE ABOVE SAID CLOSURE MEANS, PORTIONS OF SAID FIRST PASSAGEWAY MEANS BEING DEFINED BY SEPARABLE PORTIONS OF SAID WELLHEAD ASSEMBLY, FIRST CONDUIT MEANS FORMING A PORTION OF SAID SEPARABLE PORTIONS OF SAID WELLHEAD ASSEMBLY DEFINING SAID FIRST PASSAGEWAY MEANS, A CONNECTOR MEANS CARRIED ON ONE END OF SAID FIRST CON-
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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) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |