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:
Mar. 14, 1989
Filed:
Jan. 22, 1988
Applicant:
Inventors:
Akira Shinzawa, Yokohama, JP;
Yoshiki Kohno, Yokohama, JP;
Assignee:
Nippon Oil Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01B / ;
U.S. Cl.
CPC ...
252567 ; 252579 ; 336 94 ;
Abstract
An electric device particularly adapted for a fire retardant oil-filled transformer, comprising a cellulose-based insulating material impregnated with an insulating oil composed of 100 parts by weight of an ester of a polyol with a fatty acid having a fire point of 300.degree. C. or above and, incorporated therein, 0.005 to 1.0 part by weight of a phenolic compound having no alkyl groups as the substituent at the ortho positions and 0.01 to 2.0 parts by weight of an epoxy compound.