US Patent No: 4,580,007

Number of patents in Portfolio can not be more than 2000

Stylus devices responsive to pressure changes for use in videographic and like apparatus

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Abstract

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A stylus device for use in a videographic apparatus, includes a housing with a projecting stylus. In operation, pressure changes cause movement of the resiliently mounted stylus. This carries a magnet which co-operates with a Hall Effect transducer such that the pressure variation is converted into signal changes by the transducer. A moveable carrier allows the transducer to be moved to adjust the preload pressure in the stylus together with the preload out-put of the transducer.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
QUANTEL LIMITEDNEWBURY114

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bowman, David W Grove City, OH 2 18
Searby, Anthony D Newbury, GB2 15 560

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Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
GTCO CORPORATION (3)
5,004,871 Digitizer stylus having side switch 21 1989
5,109,141 Digitizer stylus with z-axis side control 11 1990
5,581,052 Pressure sensitive stylus having resiliently compressible tip element 23 1995
 
GLOBAL 360, INC. (2)
5,060,135 Apparatus for manipulating documents in a data processing system utilizing reduced images of sheets of information which are movable 172 1988
5,161,213 Method for black and white image reduction based upon averaging black/white pixel counts of neighboring blocks 44 1991
 
OPEN TEXT S.A. (2)
5,442,795 System and method for viewing icon contents on a video display 80 1990
5,625,833 Document annotation & manipulation in a data processing system 159 1995
 
WACOM CO., LTD. (2)
RE34187 Coordinates input system 28 1990
5,134,388 Electronic blackboard system marker and eraser therefor 51 1991
 
Automated Decisions, Inc. (1)
5,248,855 Gravity sensing digitizing stylus 16 1992
 
CALCOMP INC. (1)
5,357,062 Pressure sensing apparatus for digitizer pen tip 29 1993
 
CALCOMP TECHNOLOGY, INC. (1)
RE34095 Digitizer stylus with pressure transducer 25 1990
 
CANON KABUSHIKI KAISHA (1)
6,496,206 Displaying thumbnail images of document pages in an electronic folder 115 1998
 
CIRQUE CORPORATION (1)
5,914,708 Computer input stylus method and apparatus 160 1996
 
SUMMAGRAPHICS CORPORATION (1)
5,061,828 Digitizer stylus with Z-axis side pressure control 13 1990
 
Other [Check patent profile for assignment information] (1)
5,530,207 Apparatus for making drawings on a sheet-like drawing carrier, for example a sheet of transparent paper, by means of a device for producing points, lines or the like, such as a pen or pencil or a pair of compasses 4 1992