The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 31, 1984
Filed:
Feb. 21, 1980
Julien C Mathieu, Waynesville, NC (US);
Dayco Corporation, Dayton, OH (US);
Abstract
An electrically heated fluid conduit includes a plastic pipe adapted to carry a flow of fluid subject to freezing at low temperatures, an electric resistance heater disposed around the pipe and extending along the length thereof and a thermal insulating jacket disposed around the heater. The heater is formed as a seamless sleeve of synthetic polymeric material having electrically conductive carbonaceous particles therein and is connected to the lead wires of an electrical power cable by a pair of spaced electrically conductive bands fixed around the sleeve and defining the length of the heater along the pipe. The thermal insulating jacket is formed as a seamless layer of foamed synthetic plastic material having randomly disposed air pockets. The outer portion of the jacket is compacted to reduce size of the air pockets immediately adjacent to the outer surface of the jacket so that the jacket has a higher density wear and impact resistant outer surface and good thermal insulating properties adjacent the pipe and heater.