Biosig Instruments, Inc. v. Nautilus, Inc., No. 12-1289 (Fed. Cir. 2015)Annotate this Case
Biosig’s 753 patent is directed to a heart rate monitor that purports to improve upon the prior art by effectively eliminating “noise” signals during the process of detecting a user’s heart rate. The patent discloses an apparatus preferably mounted on exercise equipment that measures heart rates by processing electrocardiograph signals from which electromyogram signals are substantially removed. Biosig sued, alleging that Nautilus infringed claims 1 and 11 of the 753 patent. After claim construction, the district court granted Nautilus’s motion for summary judgment, finding the patent invalid for indefiniteness. The Federal Circuit found the claims at issue were not invalid for indefiniteness. The Supreme Court, rejected the “not amenable to construction or insolubly ambiguous” standard and vacated and remanded. The Federal Circuit maintained its reversal of the district court’s determination that Biosig’s patent claims are indefinite, holding that the “spaced relationship” phrase “inform[s] those skilled in the art about the scope of the invention with reasonable certainty.”
This opinion or order relates to an opinion or order originally issued on April 26, 2013.