erox CorporationBallistic aerosol marking apparatus for marking a substrateUS651935126 Oct 200111 Feb 2003Hitachi, Ltd.Method and apparatus for recording and reproducing electronic watermark information, and recording mediumUS653317420 Oct 199818 Mar 2003Symbol Technologies, Inc.Method and apparatus for reading and writing indicia such as bar codes using a scanned laser beamUS653561424 Ago 199818