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. 08, 1994
Filed:
Oct. 26, 1992
Applicant:
Inventors:
Gerfried Pruckmayr, Media, PA (US);
Robert B Osborne, North Tonawanda, NY (US);
Assignee:
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568617 ; 568608 ; 525410 ; 549429 ;
Abstract
Treatment of poly(tetramethylene ether) glycols with acid catalysts at elevated temperatures leads to a chain coupling with rapid increase in molecular weight. Various alcohols including diols and triols can be incorporated into poly(tetramethylene ether) glycol backbone with modified properties and performance.