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. 04, 2002
Filed:
Oct. 22, 1999
Applicant:
Inventor:
Masao Umezawa, Shiga, JP;
Assignee:
DuPont-Toray Co. Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 1/828 ; D01D 1/002 ; D01F 6/70 ;
U.S. Cl.
CPC ...
C08G 1/828 ; D01D 1/002 ; D01F 6/70 ;
Abstract
A process for melt-spinning solution-polymerized polyurethanes, based on polvether glycols and MDI at an addition ratio of 1.8 to 6.0, glycol chain extenders and a chain terminator to produce number average molecular weights of the polyurethanes of 40,000-150,000, and 5-2500 decitex spandex made thereby, are provided.