Patents Assigned to Unisert Systems, Inc.
  • Multilayer pipe joint
    Patent number: 4400019
    Abstract: The invention is directed to a multilayer pipe joint and, more particularly, to a pipe joint for effectively joining sections of pipe having an outer metal casing, an inner plastic pipe, and an annular cement grout sleeve. The joint comprises a dual material ring which is at least partially fitted within a recessed annular space at the end of each multilayer pipe section. The metal casing may be welded to the outer steel component of the ring, and the inner plastic pipe is sealed against the plastic component of the pipe.
    Type: Grant
    Filed: April 22, 1981
    Date of Patent: August 23, 1983
    Assignee: Unisert Systems, Inc.
    Inventor: Benant E. Fruck