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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Importance

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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 LIMITEDNEWBURY33

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 15 582

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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 24 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 173 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 81 1990
* 5,625,833 Document annotation & manipulation in a data processing system 162 1995
 
WACOM CO., LTD. (2)
* RE34187 Coordinates input system 28 1990
* 5,134,388 Electronic blackboard system marker and eraser therefor 52 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 161 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
* Cited By Examiner