EUGENE A. WRIGHT, Circuit Judge:
This appeal raises issues concerning a patent's validity and infringement: (a) the "on sale" proscription; (b) nonobviousness; (c) combination of known elements; (d) standards for reissuance and (e) intervening rights.
Appellee, George K. Austin, Jr., alleges that appellant, Marco Dental Products, Inc. (Marco Dental), infringed Claim No. 1 in his patent [U. S. Patent No. Re 28,649] for a "dental handpiece control." His company...
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