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:
Apr. 09, 1991
Filed:
Jun. 12, 1989
Thomas L Guggenheim, Scotia, NY (US);
James M Fukuyama, Clifton Park, NY (US);
John J Kelly, Troy, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
Copolyestercarbonates are prepared by the reaction of at least one cyclic polycarbonate oligomer with at least one cyclic polyester oligomer in the presence of a cyclic polycarbonate polymerization catalyst at temperatures in the range of about 280.degree.-375.degree. C. Mixtures of bisphenol A polycarbonate and bisphenol A isophthalate or terephthalate oligomers are preferably employed, and the preferred catalysts are tetraarylborate salts such as tetra-n-butylammonium tetraphenylborate.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile