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:
Mar. 25, 2008
Filed:
Dec. 19, 2002
Steven Joseph Hamrock, Stillwater, MN (US);
Linda Mae Rivard, Stillwater, MN (US);
George Gower Innes Moore, Afton, MN (US);
Harold Todd Freemyer, Woodbury, MN (US);
Steven Joseph Hamrock, Stillwater, MN (US);
Linda Mae Rivard, Stillwater, MN (US);
George Gower Innes Moore, Afton, MN (US);
Harold Todd Freemyer, Woodbury, MN (US);
3M Innovative Properties Company, Saint Paul, MN (US);
Abstract
A polymer electrolyte membrane is provided having a thickness of 90 microns or less and comprising a polymer, said polymer comprising a highly fluorinated backbone and recurring pendant groups according to the formula:YOSO—CF—CF—CF—CF—O-[polymer backbone]  (I)where Y is Hor a monovalent cation such as an alkali metal cation. Typically, the membrane is a cast membrane. Typically, the polymer has a hydration product of greater than 22,000. Typically, the polymer has an equivalent weight of 800-1200.