Electric welding pipe joint having a two layer outer member

Details Electric welding pipe joint having a two layer outer member Electric welding pipe joint having a two layer outer member

1995-07-20

1997-04-08

Nicholson, Eric K.

Pipe joints or couplings

With assembly means or feature

Molded joint facilitator

285284, 156294, 219544, F16L 4702

Patent

active

056180659

ABSTRACT:
An electric welding pipe joint made of a thermoplastic resin and containing a heating resistance wire therein may be produced by forming an inner cylindrical thermoplastic resin member by injection molding, winding a heating resistance wire around the inner cylindrical thermoplastic resin member, and forming two or more layers of an outer cylindrical thermoplastic resin member around the resistance wire-wound inner cylindrical member by injection molding successively.

REFERENCES:
patent: 4224505 (1980-09-01), Sturm
patent: 4375591 (1983-03-01), Sturm
patent: 4784285 (1988-11-01), Patel
patent: 4825534 (1989-05-01), White et al.
patent: 5125690 (1992-06-01), Taylor et al.
patent: 5163713 (1992-11-01), Brettell et al.
patent: 5255943 (1993-10-01), Keller et al.
patent: 5364130 (1994-11-01), Thalmann
patent: 5375889 (1994-12-01), Nakashiba et al.

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