SUMMAGRAPHICS CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5194852 Electro-optic slate for direct entry and display and/or storage of hand-entered textual and graphic informationExpiredJun 16, 89Mar 16, 93[G09G]
5191480 Optical accessory for digitizer cursorsExpiredNov 13, 89Mar 02, 93[G09G, G02B]
5173793 Liquid crystal shutter for backlit digitizerExpiredApr 15, 92Dec 22, 92[G02F]
5153570 Magnification assembly for digitizer cursorExpiredNov 13, 89Oct 06, 92[G09G]
5113042 Digitizer tablet with reduced radiation susceptibilityExpiredNov 20, 90May 12, 92[G08C]
5101487 Method for retrieving compressed data from a memory storing a look-up tableExpiredMay 16, 89Mar 31, 92[G06F]
5066833 Low power sensing apparatus for digitizer tabletsExpiredNov 13, 90Nov 19, 91[G08C]
5065145 Method and apparatus for producing signals corresponding to the position of a cursorExpiredOct 06, 89Nov 12, 91[G09G]
5061828 Digitizer stylus with Z-axis side pressure controlExpiredNov 21, 90Oct 29, 91[G08C]
5034234 Microwave heating and serving packageExpiredNov 14, 89Jul 23, 91[A23L, H05B, B65D]
5014044 Magnification assembly for digitizer cursorExpiredMay 27, 88May 07, 91[G09G]
4999462 Position determining and digitizing method and deviceExpiredOct 06, 89Mar 12, 91[G08C]
4996393 Digitizer tablet with split-current conductor arrayExpiredApr 03, 90Feb 26, 91[G08C]
4985602 Self-locking support for digitizer coverExpiredJul 13, 89Jan 15, 91[G08C]
4936683 Optical tablet constructionExpiredJun 22, 89Jun 26, 90[G01C, G01B]
4896002 Method and apparatus for displaying raw tablet location dataExpiredJun 19, 89Jan 23, 90[G08C]
4888710 Pen tip position detectorExpiredDec 11, 87Dec 19, 89[G01D, G06K]
4857903 Electro-optical mouse with improved resolution for compensation of optical distortionExpiredMay 06, 86Aug 15, 89[G09G]
4839634 Electro-optic slate for input/output of hand-entered textual and graphic informationExpiredDec 01, 86Jun 13, 89[G09G]
4831566 Method and apparatus for calibration of a charge ratio digitizerExpiredMar 20, 87May 16, 89[G08C, G01B]

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