Patents Assigned to Naylor Bros. (Clayware) Limited
  • Pipe connector having an integral sealing member and method of making
    Patent number: 4834428
    Abstract: A pipe connector comprising a moulded thermoplastics sleeve and a captive annular sealing ring.So that a root portion of the sealing ring is firmly bonded to the thermoplastics material of the sleeve, the materials are mutually compatible and the injection of the thermoplastics material during moulding has cleansed and/or scoured the root portion of the sealing ring.
    Type: Grant
    Filed: June 20, 1986
    Date of Patent: May 30, 1989
    Assignee: Naylor Bros. (Clayware) Limited
    Inventor: Robert J. Pritchatt
  • Sewer pipes
    Patent number: 4673198
    Abstract: Sewer pipes and connector means therefor whereby they can be connected during pipe jacking or moling, the connector means including a sleeve element and a resilient sealing ring located in a groove in a spigot portion of the sewer pipe, means also being provided to prevent the complete disengagement of the end of a sewer pipe from the sleeve.
    Type: Grant
    Filed: October 29, 1985
    Date of Patent: June 16, 1987
    Assignee: Naylor Bros. (Clayware) Limited
    Inventor: Robert J. Pritchatt