The Federal Circuit affirmed the PTAB's determination that claims 1–3, 9–13, and 16–17 of U.S. Patent No. 9,010,578, owned by Medmix Switzerland AG and directed to a fluid mixing and discharging arrangement, would have been obvious over Keller '574 or Heusser in combination with Yu. The central dispute involved construction of the claim term "at least two ramps," with Medmix arguing it required an "inclined plane" shape while Xinial contended it did not require any specific shape. The Board adopted Xinial's position and found the claims obvious; Medmix appealed, challenging both claim construction and the Board's motivation-to-combine findings.
The court's claim construction analysis applied Phillips by examining claim language, specification, and prosecution history to reject patent owner's effort to import limitations from preferred embodiments. Though the specification's figures depicted ramps as inclined planes and one passage used the word "likewise" in proximity to "inclined plane," the court held these did not constitute the "clear indication" required to narrow claims beyond their plain meaning, particularly where the specification expressly disclaimed limiting effect of its "preferred illustrative embodiments." On motivation to combine, the court distinguished Henny Penny's teaching that benefits and disadvantages must be weighed, finding substantial evidence supported the Board's determination that a skilled artisan could "easily" mitigate the patent owner's asserted leakage concerns by using tangs and flanges to reinforce the connection.