RICH, Circuit Judge.
Bartfeld et al. (hereinafter "Bartfeld") appeal from the March 30, 1990 decision of the Patent and Trademark Office (PTO) Board of Patent Appeals and Interferences (Board), reported at 16 USPQ2d 1714, affirming the PTO examiner's rejection of claims 1-12 and 14-45 of application Serial No. 06/734,450 (the '450 application),
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