Tubular goods joint
Patent 4705307 Issued on November 10, 1987. Estimated Expiration Date: 
November 10, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 10, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 278800 2926937 3100656 3185501 3259404 Tubing or casing joint Hydril-type connector Pipe connection Pipe joint Patent #: 4591195 InventorAssigneeApplicationNo. 06/652973 filed on 09/21/1984US Classes:285/332.3, Interface285/334, Flat crest285/350Extrusion recessExaminersPrimary: Callaghan, Thomas F.Attorney, Agent or FirmInternational ClassesF16L 15/00 (20060101)F16L 15/04 (20060101) E21B 17/02 (20060101) E21B 17/042 (20060101) AbstractAn improvement to the sealing ring of U.S. Pat. No. 4,085,951 is disclosed, wherein the sealing ring is of a special design including an in situ sealing flange generating corner, and the stepped thread pin and box members have been modified in the shoulder areas between the thread sections thereof to provide a pressure transmitting area for transmitting torque to the ring, and to provide room for the in situ sealing flange to form and extend beyond the faces of the improved ring.With the improved design, the sealing ring is capable of retaining hot gases or liquids with a pressure differential in at least a given direction across the sealed joint exceeding the yield pressure of the rubber or plastic of which the ring is made. | |
