Abstract: Welding muffs for joining thermoplastic pipes are molded using a core in which are placed terminals supported by plastic posts which may be removable and/or frangible so that when the cores are withdrawn the plastic posts do not prevent withdrawal.
Type:
Grant
Filed:
September 2, 1987
Date of Patent:
May 2, 1989
Assignee:
Du Pont U.K. Ltd.
Inventors:
Peter White, Ronald A. Street, Christopher I. Greaves, Gordon Harrison