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. 11, 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 made from a polymer comprising imidazole groups, said method comprising: a) contacting never-dried sulfate anion-containing polymeric-fiber with an halide-containing acid to displace at least a portion of the sulfate ions with halide anions; and b) rinsing the fiber to remove the displaced sulfate ions.