Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2007-01-23
2007-01-23
Choi, Ling-Sui (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S348100, C526S242000, C526S287000, C521S027000, C521S028000, C521S025000, C521S031000, C525S199000, C525S200000
Reexamination Certificate
active
11032779
ABSTRACT:
Solid and liquid compositions containing particles of highly fluorinated ion-exchange polymer having sulfonate functional groups with an ion exchange ratio of less than about 33. The compositions contain at least about 25% by weight of polymer particles having a particle size of about 2 nm to about 30 nm.
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Curtin Dennis Edward
Howard Edward George
Choi Ling-Sui
E. I. du Pont de Nemours and Company
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