US Patent No: 5,914,708

Number of patents in Portfolio can not be more than 2000

Computer input stylus method and apparatus

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Abstract

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A system comprising a conductive stylus used in conjunction with a capacitance sensitive touch pad, said system providing at least two different signals to an associated computer system. The stylus is a pen-like device having an actuable switch which when actuated substantially increases the capacitive disturbance caused by the conductive stylus on the touch pad. Before actuation, the stylus creates a capacitive disturbance sufficient for circuitry in the touch pad to measure as crossing a first predefined capacitive disturbance threshold when the foam covered conductive stylus tip is brought in contact with the surface of the touch pad. When the switch is actuated, the capacitive disturbance measured by the touch pad increases sufficient to cross a second predefined capacitive disturbance threshold. An associated computer program for drawing on a computer display places a cursor on the display when the first threshold is crossed. The computer program begins drawing on the display beginning at the cursor location when the switch is actuated causing the second threshold to be crossed. Placing a conductive foam cover over the conductive stylus tip results in the measured capacitive disturbance being amplified to thereby increase the magnitude of the capacitive disturbance of the stylus.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CIRQUE CORPORATIONSALT LAKE CITY, UT37

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Donohue, Tom Provo, UT 1 158
Gerpheide, George E 3481 S. Monte Verde, Salt Lake City, UT 84109 16 2004
LaGrange, George W Salt Lake City, UT 1 158
Layton, Mike Salt Lake City, UT 1 158
Woolley, Richard D Orem, UT 34 243

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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Quantel Limited (1)
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TV INTERACTIVE DATE CORPORATION (1)
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U.S. Philips Corporation (1)
5,461,204 Segmented-core inductance in stylus for EM-graphical tablet 28 1994
 
Other [Check patent profile for assignment information] (1)
5,453,759 Pointing device for communication with computer systems 45 1994

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
CYPRESS SEMICONDUCTOR CORPORATION (69)
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IMMERSION CORPORATION (20)
7,265,750 Haptic feedback stylus and other devices 23 2002
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8,040,330 Untethered stylus empolying multiple reference frequency communication 0 2006
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HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (8)
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6,266,240 Encasement for a handheld computer 61 2000
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HRL LABORATORIES, LLC (1)
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HYPERCOM CORPORATION (1)
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MIMIO, LLC (1)
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