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:
Dec. 19, 2017
Filed:
Jan. 11, 2012
Steven R. Allen, Midlothian, VA (US);
Vlodek Gabara, Richmond, VA (US);
Joseph Lenning Lowery, Midlothian, VA (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);
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 yarn comprising the steps of: a) contacting never-dried polymeric yarn with an aqueous base, the polymer comprising imidazole groups and said polymer comprising sulfur atoms characterized as being in the form of sulfate anions; b) contacting the yarn with an aqueous acid solution of pH 5 or lower; and c) rinsing the yarn.