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. 15, 1977
Filed:
May. 05, 1975
Applicant:
Inventors:
Yorihiko Omoto, Matsuyama, JA;
Teruo Matsunaga, Matsuyama, JA;
Assignee:
Teijin Limited, Osaka, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
260 / ; 2604 / ;
Abstract
A process for preparing a polyester by carrying out the ester-interchange reaction of a lower alkyl ester of terephthalic acid and a glycol in the presence of a calcium compound and a lithium compound having ester-interchange catalysis capacities in amounts satisfying all of the following relationships: