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:
Aug. 06, 2002
Filed:
Aug. 21, 2001
Applicant:
Inventors:
Wen-Fa Lin, Hsinchu Hsien, TW;
Chuan-Yang Liu, Hsinchu, TW;
Jun-Yi Chen, Hsinchu, TW;
Long-Shuenn Jean, Chiai Hsien, TW;
Assignee:
TCC Chemical Corporation, Chang Hua, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
C07D / ;
Abstract
The invention discloses a method for depolymerization of a mixture containing polytetrahydrofuran derivatives, including heating the mixture comprising polytetrahydrofuran derivatives at 100-250° C. in the presence of a &bgr;-zeolite catalyst to obtain tetrahydrofuran, whereby the tetrahydrofuran monomer can be recovered from the waste materials in the preparation of polytetramethylene ether glycols.