Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2006-06-13
2006-06-13
Wu, David W. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S331600, C525S331300, C525S535000, C522S151000, C522S155000, C522S162000
Reexamination Certificate
active
07060756
ABSTRACT:
A method is provided for obtaining crosslinked polymers having pendent sulfonic acid groups by crosslinking through the sulfonic acid groups or their precursors with aromatic crosslinkers or aromatic pendent crosslinking groups to form aromatic sulfones. Such crosslinked polymers may be used to make polymer electrolyte membranes (PEM's) that may be used in electrolytic cells such as fuel cells.
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Hamrock Steven J.
Jing Naiyong
Yandrasits Michael A.
3M Innovative Properties Company
Dahl Philip Y.
Wu David W.
Wu Ives
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