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•12TypeofDocumentUnitedStatesPatentlastnameetal.•10Patentnumber20011211200112pre-grantpublication18•11Patentnumber2001126,611,362DD203446PPPP6,123•45Dateofpatents•54/Title•75Inventors•73Asingnee•21Appl.No.USPTO•22Filed•65PriorPublicationData•63RelatedUSApplicaitonData•51Int.Cl78H04N104•52USCl.CurrentUSClassification•58FieldofSearch52583583553993482712818411640248358474498471497400401473472505501296•56ReferencesCited:USPatentDocumentsForeignPatentDocumentsOtherPublication•57Abstract