The methods are particularly applicable in woodworking equipment such as power saws to distinguish contact between a person...http://www.google.com/patents/US8087438?utm_source=gb-gplus-sharePatent US8087438 - Detection systems for power equipmentAdvanced Patent SearchPublication numberUS8087438 B2Publication typeGrantApplication numberUS 12/799,915Publication dateJan 3, 2012Filing dateMay 3, 2010