A door stopper that is mounted directly to a door knob or a door handle of a door is disclosed. The door stopper is preferably made as a single piece from an elastomeric material so that it can easily slip over and substantially conform to the shape of various types of door knobs and door handles. The...http://www.google.com/patents/US5933915?utm_source=gb-gplus-sharePatent US5933915 - Universal slip-on door stopper
