| US 7,572,387 B2 | ||
| Polymer electrolyte medium and direct methanol fuel cell | ||
| Tomoaki Arimura, Ome (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Jun. 15, 2005, as Appl. No. 11/152,078. | ||
| Claims priority of application No. 2004-285456 (JP), filed on Sep. 29, 2004. | ||
| Prior Publication US 2006/0068238 A1, Mar. 30, 2006 | ||
| Int. Cl. H01G 9/02 (2006.01); H01M 8/10 (2006.01) | ||
| U.S. Cl. 252—62.2 [429/33] | 20 Claims |
1. A polymer electrolyte medium expressed by the following formula (I):
 where R1 in the formula represents an aromatic radical-containing functional group, R2 represents an alkyl functional group, R3 represents an ion exchange aromatic functional group, and u represents an integer of 1 to 450.
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