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:
Sep. 04, 2007
Filed:
Nov. 13, 2003
Michael A. Yandrasits, Hastings, MN (US);
Steven J. Hamrock, Stillwater, MN (US);
Klaus Hintzer, Kastl, DE;
Arne Thaler, Altoetting, DE;
Tatsuo Fukushi, Woodbury, MN (US);
Naiyong Jing, Woodbury, MN (US);
Kai Helmut Lochhaas, Neuoetting, DE;
Michael A. Yandrasits, Hastings, MN (US);
Steven J. Hamrock, Stillwater, MN (US);
Klaus Hintzer, Kastl, DE;
Arne Thaler, Altoetting, DE;
Tatsuo Fukushi, Woodbury, MN (US);
Naiyong Jing, Woodbury, MN (US);
Kai Helmut Lochhaas, Neuoetting, DE;
3M Innovative Properties Company, Saint Paul, MN (US);
Abstract
A method is provided for making a crosslinked polymer electrolyte, typically in the form of a membrane for use as a polymer electrolyte membrane in an electrolytic cell such as a fuel cell, as well as the polymer so made, the method comprising application of electron beam radiation to a highly fluorinated fluoropolymer comprising: a backbone derived in part from tetrafluoro-ethylene monomer, first pendent groups which include a group according to the formula —SOX, where X is F, Cl, Br, OH or —OM, where Mis a monovalent cation, and second pendent groups which include Br, Cl or I. Typically, the membrane has a thickness of 90 microns or less, more typically 60 or less, and most typically 30 microns or less.