Assignee
SUMMAGRAPHICS CORP
66 patents
Top patents by PatentIndex Score
USD284084SJun 3, 1986
Digitizer
SUMMAGRAPHICS CORP525 citations99
US5065145ANov 12, 1991
Method and apparatus for producing signals corresponding to the position of a cursor
SUMMAGRAPHICS CORP95 citations95
US4999462AMar 12, 1991
Position determining and digitizing method and device
SUMMAGRAPHICS CORP82 citations95
US4794388ADec 27, 1988
Method of and apparatus for controlling a display
SUMMAGRAPHICS CORP62 citations93
US4786764ANov 22, 1988
Digitizer stylus with pressure transducer
SUMMAGRAPHICS CORP65 citations93
US4081603AMar 28, 1978
Position coordinate determination device
SUMMAGRAPHICS CORP54 citations93
US5004871AApr 2, 1991
Digitizer stylus having side switch
SUMMAGRAPHICS CORP34 citations92
US5001306AMar 19, 1991
Distributed optical fiber device for digitizer tablet
SUMMAGRAPHICS CORP34 citations92
US4977315ADec 11, 1990
Liquid crystal position determining system and wand device
SUMMAGRAPHICS CORP23 citations92
US5581052ADec 3, 1996
Pressure sensitive stylus having resiliently compressible tip element
SUMMAGRAPHICS CORP72 citations91
US5416280AMay 16, 1995
Digitizer tablet using relative phase detection
SUMMAGRAPHICS CORP24 citations91
US5229551AJul 20, 1993
Hysteresis compensation for a digitizer tablet
SUMMAGRAPHICS CORP27 citations91
US5153386AOct 6, 1992
Digitizer tablet with illuminable working surface
SUMMAGRAPHICS CORP29 citations91
US5111005AMay 5, 1992
Graphics tablet with n-dimensional capability
SUMMAGRAPHICS CORP35 citations91
US5066833ANov 19, 1991
Low power sensing apparatus for digitizer tablets
SUMMAGRAPHICS CORP30 citations91
US5004872AApr 2, 1991
Digitizer tablet with pressure stylus
SUMMAGRAPHICS CORP38 citations91
US4952757AAug 28, 1990
Low-power electromagnetic digitizer tablet
SUMMAGRAPHICS CORP49 citations91
US4943689AJul 24, 1990
Backlit digitizer tablet
SUMMAGRAPHICS CORP36 citations91
US5383733AJan 24, 1995
Ribbon cassette for a printer
SUMMAGRAPHICS CORP34 citations90
US5369227ANov 29, 1994
Stylus switch status determination in a digitizer tablet having a cordless stylus
SUMMAGRAPHICS CORP94 citations90
US5267802ADec 7, 1993
Ribbon cassette storage and transfer apparatus for a printer
SUMMAGRAPHICS CORP30 citations90
US4857903AAug 15, 1989
Electro-optical mouse with improved resolution for compensation of optical distortion
SUMMAGRAPHICS CORP49 citations90
US4807166AFeb 21, 1989
Method and apparatus for calibrating an electro-optical mouse
SUMMAGRAPHICS CORP33 citations90
US4514688AApr 30, 1985
Digital tablet system with calibration means
SUMMAGRAPHICS CORP31 citations90
US4482784ANov 13, 1984
Position determination device
SUMMAGRAPHICS CORP44 citations90
US5214448AMay 25, 1993
Belt-drive tensioning system which uses a pivoting member
SUMMAGRAPHICS CORP32 citations89
USD327476SJun 30, 1992
Digitizing stylus
SUMMAGRAPHICS CORP29 citations89
US4018989AApr 19, 1977
Position coordinate determination device
SUMMAGRAPHICS CORP43 citations89
US4831566AMay 16, 1989
Method and apparatus for calibration of a charge ratio digitizer
SUMMAGRAPHICS CORP36 citations88
US4992630AFeb 12, 1991
Digitizer tablet with user customization of stylus proximity and pressure
SUMMAGRAPHICS CORP39 citations87
US5157227AOct 20, 1992
Digitizer tablet with regional error correction
SUMMAGRAPHICS CORP26 citations86
US4568182AFeb 4, 1986
Optical system for determining the position of a cursor
SUMMAGRAPHICS CORP36 citations86
US4936683AJun 26, 1990
Optical tablet construction
SUMMAGRAPHICS CORP57 citations85
US5051545ASep 24, 1991
Digitizer with serpentine conductor grid having non-uniform repeat increment
SUMMAGRAPHICS CORP21 citations81
US4788386ANov 29, 1988
Menu for a charge ratio digitizer
SUMMAGRAPHICS CORP22 citations78
USD280725SSep 24, 1985
Cursor
SUMMAGRAPHICS CORP10 citations74
US4368352AJan 11, 1983
Digitizer with floating scan
SUMMAGRAPHICS CORP11 citations74
US5173793ADec 22, 1992
Liquid crystal shutter for backlit digitizer
SUMMAGRAPHICS CORP9 citations73
US5109141AApr 28, 1992
Digitizer stylus with z-axis side control
SUMMAGRAPHICS CORP13 citations73
US5061828AOct 29, 1991
Digitizer stylus with Z-axis side pressure control
SUMMAGRAPHICS CORP18 citations73
USD358601SMay 23, 1995
Ribbon cassette for a printer
SUMMAGRAPHICS CORP7 citations72
US5267401ADec 7, 1993
Method and apparatus for gauging reel diameters in a reel-to-reel sheet material transport system
SUMMAGRAPHICS CORP17 citations72
US5210380AMay 11, 1993
Digitizer with serpentine-type conductor grid having uniform conductor repeat increments
SUMMAGRAPHICS CORP15 citations72
US5194699AMar 16, 1993
Digitizer tablet with fixed incremented grid portions
SUMMAGRAPHICS CORP9 citations72
US5179254AJan 12, 1993
Dynamic adjustment of filter weights for digital tablets
SUMMAGRAPHICS CORP11 citations72
US5028744AJul 2, 1991
Digitizer with illuminable working surface
SUMMAGRAPHICS CORP12 citations72
US4689448AAug 25, 1987
Two-dimensional position coordinate determination device with U-shaped delay line
SUMMAGRAPHICS CORP15 citations72
US4546948AOct 15, 1985
Easel
SUMMAGRAPHICS CORP7 citations72
US5101487AMar 31, 1992
Method for retrieving compressed data from a memory storing a look-up table
SUMMAGRAPHICS CORP18 citations71
USD320787SOct 15, 1991
Digitizing stylus
SUMMAGRAPHICS CORP12 citations71
Showing the top 50 of 66 patents by PatentIndex Score.