RADER, Circuit Judge.
The Patent and Trademark Office Board of Patent Appeals and Interferences (Board) affirmed the rejection of claims 30 and 31 of patent application 07/686,016 as obvious under 35 U.S.C. § 103 (1994). The Board also rejected applicants' attempt to rebut the prima facie case of obviousness with evidence of unexpected properties. Because the applicants merely substituted one element known in the art for a known equivalent, this court affirms...
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