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:
Oct. 18, 2016
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 removing sulfur from a fiber comprising the steps of: a) contacting never-dried sulfur-containing fiber in a yarn with an aqueous base having a pKa less than or equal to 11 to release at least a portion of said sulfur, said sulfur comprising, at least in part, sulfate anions and said yarn comprising fiber derived from polymer comprising imidazole groups; and b) rinsing said yarn to remove at least a portion of released sulfur.