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:
Dec. 29, 1992
Filed:
Sep. 18, 1990
Yousuke Morita, Gunma, JP;
Toshiaki Yagi, Gunma, JP;
Waichiro Kawakami, Gunma, JP;
Seiji Kamimura, Ibaraki, JP;
Hideki Yagyu, Ibaraki, JP;
Osamu Mochizuki, Ibaraki, JP;
Takao Onishi, Ibaraki, JP;
Japan Atomic Energy Research Institute, Tokyo, JP;
Hitachi Cable Ltd., Tokyo, JP;
Abstract
This invention relates to a method or apparatus by which comparatively low-voltage electric wires and cables laid at power stations and other locations can be diagnosed for deterioration of their polymer-insulation in a non-destructive way. The method or apparatus comprises applying a torsional force to the electric wire or cable, detecting the resulting repulsion as a torque, and estimating the degree of deterioration of the polymer-insulation in the electric wire or cable on the basis of the detected value of torque.