Title: Thermally insulated pipe with electrically conducting portions for dissipating static electricity

Abstract: A thermally insulated pipe particularly destined for mining industries, comprising an outer and an inner pipe, whereinbetween an insulating layer is arranged, the outer pipe being made of a synthetic material. The surface of the outer pipe is provided with an outside surface layer, being electrically conductive, which layer is connected with the inner pipe in an electrically conducting manner. The insulating material inbetween the two pipes is heat resistant.

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Inventors: de Putter, Warner Jan (Hardenberg, NL)

Application Number: 743658
Filing Date: 1976-11-22
Publication_date: 1978-07-25
Assignee: Wavin B. V. (Zwolle, NL)
Primary Class(es): 361/215 138/103, 138/149, 174/47
Other Classes:
US Patent Ref:

1618455	Feb, 1927	Lindsay	138/149.
2041911	May, 1936	Ericson	138/149.
3943273	Mar, 1976	DE Putter	361/215.

Other Refs:
Primary Examiner: Askin, Laramie E.
Assistant Examiner:
Attorney: Wigman & Cohen