GTCO CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6118084 Pointer position detection systemExpiredOct 28, 98Sep 12, 00[G08C]
5973667 Lean-to stand for flexible digitizerExpiredJul 18, 97Oct 26, 99[A63H]
5736686 Illumination apparatus for a digitizer tablet with improved light panelExpiredMar 01, 95Apr 07, 98[G08C, G09G]
5635683 Dynamic pressure adjustment of a pressure-sensitive pointing device for a digitizerExpiredJan 04, 95Jun 03, 97[G08C]
5581052 Pressure sensitive stylus having resiliently compressible tip elementExpiredJul 26, 95Dec 03, 96[G08C]
5379269 Position determining apparatusExpiredJan 13, 93Jan 03, 95[G08C]
5247138 Cordless digitizer stylus status encoding and transmission schemeExpiredNov 08, 91Sep 21, 93[G08C]
5235142 Phase reference system for cordless looping digitizerExpiredSep 16, 91Aug 10, 93[G08C]
5227909 Single coil digitizer-coupled image scannerExpiredSep 30, 91Jul 13, 93[G02B, G06K]
5210380 Digitizer with serpentine-type conductor grid having uniform conductor repeat incrementsExpiredAug 06, 91May 11, 93[G08C]
5198623 Method for use in a digitizer for determining pen tiltExpiredNov 27, 91Mar 30, 93[G08C]
5153386 Digitizer tablet with illuminable working surfaceExpiredJan 30, 91Oct 06, 92[G08C]
5134253 Digitizer employing loopback conductor pattern using rotation sequencingExpiredJun 13, 91Jul 28, 92[G08C]
5124509 Digitizer with capacitive and inductive couplingExpiredJan 15, 91Jun 23, 92[G08C]
5111005 Graphics tablet with N-dimensional capabilityExpiredOct 04, 90May 05, 92[G08C]
5109141 Digitizer stylus with z-axis side controlExpiredJul 23, 90Apr 28, 92[G08C]
5107079 Position digitizer circuit for a moveable instrumentExpiredMar 18, 91Apr 21, 92[G08C]
5105393 SCR control for high current discharge circuitExpiredMar 19, 90Apr 14, 92[H04R, G01S]
5055831 Cursor for digitizer tabletExpiredOct 06, 89Oct 08, 91[G09G]
5054005 Apparatus and method for determining travel time of acoustic energyExpiredMar 16, 90Oct 01, 91[G08C, G01S]

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