Appeal 2006-2903
Application 10/296,359
BACKGROUND
Appellants’ invention relates to a dimensionally stable gas diffusion
electrode comprising an electroconductive catalyst support material having
applied thereto a catalyst material-containing coating composition. Gas
diffusion electrodes are useful in various electrochemical processes
including fuel cells (Specification 1). Claim 1, as presented in the Brief,
appears below:
1. A dimensionally stable gas diffusion electrode comprising:
an electroconductive catalyst support material having applied thereto a
catalyst material-containing coating composition, the catalyst support
material selected from the group consisting of a fabric, a bonded fiber web, a
foam, a sintered metal body, a felt of electroconductive material, an
expanded-metal plate and a metal plate provided with a multiplicity of
perforations, the catalyst support material permanently joined mechanically
and electroconductively to one of a gas-permeable stiff metallic baseplate, a
stiff fabric or an expanded metal; and
an electrical connection,
wherein the catalyst material-containing coating composition comprises
mixtures of finely dispersed silver powder or finely dispersed silver oxide
powder or mixtures of silver powder and silver oxide powder and
polytetrafluoroethylene (PTFE) powder or of mixtures of finely dispersed
silver powder or silver oxide powder or mixtures of silver powder and silver
oxide powder, carbon powder and PTFE powder.
The Examiner relies on the following references in rejecting the
appealed subject matter:
Gestermann US 5,693,202 Dec. 2, 1997
Ashida US 5,733,430 Mar. 31, 1998
Denton US 6,010,606 Jan. 4, 2000
2
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