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. 15, 2017
Filed:
Jan. 11, 2012
Steven R. Allen, Midlothian, VA (US);
Vlodek Gabara, Richmond, VA (US);
Joseph Lenning Lowery, Midlothian, VA (US);
Steven Raymond Lustig, Landenberg, PA (US);
Christopher William Newton, Richmond, VA (US);
David J. Rodini, Midlothian, VA (US);
Andrew J. Sitter, Mechanicsville, VA (US);
Steven R. Allen, Midlothian, VA (US);
Vlodek Gabara, Richmond, VA (US);
Joseph Lenning Lowery, Midlothian, VA (US);
Steven Raymond Lustig, Landenberg, PA (US);
Christopher William Newton, Richmond, VA (US);
David J. Rodini, Midlothian, VA (US);
Andrew J. Sitter, Mechanicsville, VA (US);
E I DU PONT DE NEMOURS AND COMPANY, Wilmington, DE (US);
Abstract
The present invention concerns methods for producing a yarn comprising the steps of: (a) producing a plurality of dope filaments by spinning a polymer solution in sulfuric acid through a multi-hole spinneret, the polymer comprising imidazole groups; (b) coagulating the plurality of dope filaments into an as-spun yarn; (c) contacting the yarn with an aqueous base having a pKa less than or equal to 11; and (d) rinsing the yarn.