Patents Assigned to Hub City Iron Works, Inc.
  • Pipe joint having pressure activated sealing means
    Patent number: 4577895
    Abstract: A joint for interconnecting a pair of pipes having two-step Hydril-type connection means disposed thereupon. A secondary sealing means is disposed on the pin member connection means within a thread groove which forms part of the seal housing along with pin and box member torque shoulders.
    Type: Grant
    Filed: January 23, 1984
    Date of Patent: March 25, 1986
    Assignee: Hub City Iron Works, Inc.
    Inventor: Alan J. Castille