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:
Jul. 21, 1992
Filed:
Feb. 15, 1991
Applicant:
Inventor:
Herman O Krabbenhoft, Scotia, NY (US);
Assignee:
General Electric Company, Schenectady, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528371 ; 528196 ; 528198 ; 528370 ;
Abstract
Cyclic polycarbonate oligomers are polymerized to linear polycarbonates by the catalytic action of a Wittig salt prepared by the reaction of a triarylphosphine with an alkyl or acyl halide. Certain Wittig salt-forming reactants may be incorporated in the cyclic polycarbonate composition, and interreact when the composition is heated to form the active catalytic species.
Krabbenhoft, Herman. (1992). Preparation of linear polycarbonates from cyclic oligomer compositions (U.S. Patent No. 5132398). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5132398
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile