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Resilient snap-on electric heating jacket for tubular objects

  • US 4,329,569 A
  • Filed: 05/01/1980
  • Issued: 05/11/1982
  • Est. Priority Date: 05/16/1979
  • Status: Expired due to Term
First Claim
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1. An electrical element including a curved surface portion, comprising(a) a thin sheet of flexible plastic material constituting the radially internal surface layer of said curved surface portion;

  • (b) a pattern of electrically conductive spaced foil loops formed on the radially external surface of said thin plastic sheet, so as to define an electrical heating element; and

    (c) a thick resilient support member of polymeric material at least coextensive with and overlying the radially external surface of said thin plastic sheet and said foil loops;

    (d) said support member being directly secured to the external surface portions of said foil loops and said thin plastic sheet between said foil loops by an autogenous bond to form a resilient unitary structure generally C-shaped in cross section, capable of being snapped onto a tube the outer diameter of which approximately corresponds to the inner diameter of the profile of said unitary structure; and

    (e) said foil loops being protectively sandwiched between said thin plastic sheet and said support member.

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