Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Reexamination Certificate
2006-09-19
2006-09-19
Choi, Ling-Sui (Department: 1713)
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
C429S006000, C429S047000, C429S047000, C429S047000, C502S208000, C427S115000
Reexamination Certificate
active
07108935
ABSTRACT:
The invention provides composite membrane materials comprising a polymer of the state of art uniformly filled with a zirconium phosphate, preferably α-zirconium phosphate or zirconium phosphate sulfoarylenphosphonate particels. The composite membrane materials are preferably prepared starting from a solution of a polymer of the state of art and from a colloidal dispersion of α-zirconium phosphate or a zirconium phosphate sulfoarylenphosphonate. The colloidal particles are transferred into the solution of the polymer preferably by mixing the dispersion with the solution or by means of phase transfer. The membrane material is preferably obtained by removing the solvent by evaporation or by a suitable non-solvent. Besides the composite membrane materials and the preparation methods, the use of the above membrane materials is claimed as ionomeric membranes with high overall performance in high tempreature, especially hydrogen, and in indirect methanol fuel cells and with decreased methanol crossover in direct methanol fuel cells.
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Alberti Giulio
Bauer Bernd
Casciola Mario
Jones Deborah
Pica Monica
Choi Ling-Sui
Fuma-Tech Gesellschaft fur Funktionelle Membranen und Anlagentec
Harkins Tanya E.
Nath Gary M.
Nath & Associates PLLC
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