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:
May. 20, 1980
Filed:
May. 09, 1978
Sadayoshi Mukai, Ukyo-ku, Kyoto, JP;
Yoshiaki Otani, Ukyo-ku, Kyoto, JP;
Osamu Yamaguchi, Ukyo-ku, Kyoto, JP;
Other;
Abstract
A method of purifying triaryl phosphate to be used as electrical insulating oil, comprising a first step of washing the phosphate with the aqueous solution of alkali, a second step of diluting the phosphate with aromatic insulating oil, a third step of treating the diluted phosphate with acid clay in an atmosphere of dry gas so that the acid clay adsorbs the impurities in the phosphate and a fourth step of treating the phosphate under reduced pressure for removal of any remaining impurities therefrom.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile