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:
Jun. 27, 1978
Filed:
Dec. 03, 1975
Applicant:
Inventors:
Takeaki Megumi, Sakai, JA;
Shigeo Kondo, Toyonaka, JA;
Assignee:
Mitsubishi Gas Chemical Company, Inc., Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
260 / ; 260 / ;
Abstract
High molecular weight polycarbonates are prepared by the reaction of phosgene with a dihydroxydiaryl alkane in the presence of an acid acceptor, a solvent and at least one member selected from specified monohydric alcohols, haloformates, monothiols, halothioformates, monocarboxylic acids and halides, salts, quaternary ammonium salts and anhydrides thereof.
Megumi, Takeaki. (1978). Process for preparing high molecular weight polycarbonates (U.S. Patent No. 4097457). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4097457
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile