The case of Ibormeith IP LLC v. Mercedes-Benz USA, LLC, Dkt. No. 2013-1007 (Fed. Cir. Oct. 22, 2013) is another case where means-plus-function claims were found invalid for lack of an adequate algorithm/structure disclosed in the description of the patent.
Ibormeith sued Mercedes alleging that Mercedes vehicles having an Attention Assist feature infringed U.S. Patent No. 6,313,749. The ‘749 patent is titled, “Sleepiness Detection for Vehicle Driver or Machine Operator.” The ‘749 patent is directed to monitoring conditions affecting or behavior reflecting a vehicle driver’s sleepiness. Then issuing a warning to the driver before driving is unduly impaired.
The patent discloses monitoring that takes into account sleepiness factors including, as summarized by the court, “natural body-clock (circadian rhythm), the magnitude and number of corrective steering action the …