. . . "3Siros Technologies, Inc.Optical storage media and method for optical data storage via local changes in reflectivity of a format gratingUS6533174Oct 20, 1998Mar 18, 2003Symbol Technologies, Inc.Method and apparatus for reading and writing indicia such as bar codes using a scanned laser beamUS6548796Jun 23, 1999Apr 15, 2003Regents Of The University Of MinnesotaConfocal macroscopeUS6573026Jul 28, 20" . .