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:
Feb. 03, 1976
Filed:
Nov. 13, 1974
Applicant:
Inventors:
Assignee:
Toray Industries, Inc., Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C08K / ; C08K / ; C08K / ;
U.S. Cl.
CPC ...
260 / ; 260 / ; 260 / ; 260 / ; 260 / ; 260 / ; 260 / ; 260 / ; 260 / ; 260 / ;
Abstract
A process for preparing a polyester predominantly comprised of the units derived from terephthalic acid and butanediol-1,4 is provided. The esterification or transesterification is performed in the presence of minor amounts of a catalyst combination comprising an organo-titanium compound and an organo-tin compound. The undesirable formation of tetrahydrofuran can be avoided or minimized.
Hayashi, Masahiko. (1976). Process of preparing polytetramethylene terephthalate (U.S. Patent No. 3936421). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/3936421
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile