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:
Jun. 15, 1999
Filed:
Sep. 30, 1997
Applicant:
Inventors:
Stephen Dana Hall, Wilmington, NC (US);
Richard Redfearn Hepner, Wilmington, NC (US);
Robert Everett Michel, Wilmington, NC (US);
Donald Richard Wheatcraft, Jr, Hendersonville, TN (US);
George Malcolm Williamson, Wilmington, NC (US);
Assignee:
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08J / ;
U.S. Cl.
CPC ...
521 48 ; 521 485 ; 5283081 ; 528491 ; 528495 ; 5285 / ;
Abstract
Polyester is depolymerized by methanolysis and methanol is recovered in a process that uses methyl benzoate and/or p-methyltoluate as an azeotropic agent while the methanol is present.