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:
Nov. 22, 1988
Filed:
Mar. 21, 1984
Applicant:
Inventors:
Kazuo Okahashi, Osaka, JP;
Ichiro Takahashi, Osaka, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
138109 ; 166248 ;
Abstract
A conduct pipe covered with an electrical insulating material, which is obtained by a process comprising winding a polyether ether ketone resin film around the outside of a metal conduct pipe, carrying out impregnation treatment in vacuum under pressure with using an impregnant resin comprising an ether bonding epoxy resin, and thereafter hardening by heating, is disclosed. The conduct pipe is particularly useful in an electrode apparatus for collecting underground hydrocarbon resources by an electrically heating method.