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Heat fusion fitting

  • US 6,998,588 B2
  • Filed: 06/03/2003
  • Issued: 02/14/2006
  • Est. Priority Date: 05/22/1997
  • Status: Expired due to Fees
First Claim
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1. A heat fusion fitting comprising a body of hollow, tubular construction comprising at least a first, outer layer of a first cross-linked polymeric material, the body being expandable at a temperature below the crystalline melting point or softening point of the first polymeric material, the fitting further comprising a second, inner layer of a second polymeric material and a ferromagnetic heating element, the ferromagnetic heating element being embedded or partly embedded in the second layer and having a Curie temperature equal to or greater than the crystalline melting point or softening point of the second polymeric material, the body and the insert being assembled to form the fitting such that there is still some unresolved recovery in the body region surrounding the ferromagnetic heating element.

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