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Referenced by

Citing PatentFiling dateIssue dateOriginal AssigneeTitle
US407825723 Aug 19767 Mar 1978Hewlett-Packard CompanyCalculator apparatus with electronically alterable key symbols
US408530222 Nov 197618 Apr 1978Control Data CorporationMembrane-type touch panel
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US495814822 Jan 198818 Sep 1990Elmwood Sensors, Inc.Contrast enhancing transparent touch panel device
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US747233826 Jun 200130 Dec 2008International Business Machines CorporationMethod and apparatus for locating items on a physical document and method for creating a geographical link from an electronic document to the physical document
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US757440723 Jul 200311 Aug 2009International Business Machines CorporationSystem and method for selecting, ordering and accessing copyrighted information from physical documents
US81123637 Aug 20097 Feb 2012International Business Machines CorporationSelecting, ordering and accessing copyrighted information from physical documents
US819604121 Aug 20075 Jun 2012International Business Machines CorporationMethod and system for processing information relating to active regions of a page of physical document