Alexander M. Purcell

Person

Guilford, CT, US

People

Patents Grantslast 30 patents

Information Patent Grant
Liquid crystal shutter for backlit digitizer
- Patent number 5,173,793
- Issue date Dec 22, 1992
- Summagraphics Corporation
- Alexander M. Purcell
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Digitizer tablet with illuminable working surface
- Patent number 5,153,386
- Issue date Oct 6, 1992
- Summagraphics Corporation
- David A. Siefer
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Digitizer stylus with z-axis side control
- Patent number 5,109,141
- Issue date Apr 28, 1992
- Summagraphics Corporation
- Alexander M. Purcell
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Method and apparatus for producing signals corresponding to the pos...
- Patent number 5,065,145
- Issue date Nov 12, 1991
- Summagraphics Corporation
- Alexander M. Purcell
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Digitizer stylus with Z-axis side pressure control
- Patent number 5,061,828
- Issue date Oct 29, 1991
- Summagraphics Corporation
- Alexander M. Purcell
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Digitizer with illuminable working surface
- Patent number 5,028,744
- Issue date Jul 2, 1991
- Summagraphics Corporation
- Alexander M. Purcell
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Digitizer stylus having side switch
- Patent number 5,004,871
- Issue date Apr 2, 1991
- Summagraphics Corporation
- Alexander M. Purcell
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Distributed optical fiber device for digitizer tablet
- Patent number 5,001,306
- Issue date Mar 19, 1991
- Summagraphics Corporation
- Alexander M. Purcell
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Position determining and digitizing method and device
- Patent number 4,999,462
- Issue date Mar 12, 1991
- Summagraphics Corporation
- Alexander M. Purcell
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Liquid crystal position determining system and wand device
- Patent number 4,977,315
- Issue date Dec 11, 1990
- Summagraphics Corporation
- Alexander M. Purcell
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Low-power electromagnetic digitizer tablet
- Patent number 4,952,757
- Issue date Aug 28, 1990
- Summagraphics Corporation
- Alexander M. Purcell
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Backlit digitizer tablet
- Patent number 4,943,689
- Issue date Jul 24, 1990
- Summagraphics Corporation
- David A. Siefer
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Optical tablet construction
- Patent number 4,936,683
- Issue date Jun 26, 1990
- Summagraphics Corporation
- Alex M. Purcell
- G06 - COMPUTING CALCULATING COUNTING

Alexander M. Purcell

Person

Patents Grantslast 30 patents

Liquid crystal shutter for backlit digitizer

Digitizer tablet with illuminable working surface

Digitizer stylus with z-axis side control

Method and apparatus for producing signals corresponding to the pos...

Digitizer stylus with Z-axis side pressure control

Digitizer with illuminable working surface

Digitizer stylus having side switch

Distributed optical fiber device for digitizer tablet

Position determining and digitizing method and device

Liquid crystal position determining system and wand device

Low-power electromagnetic digitizer tablet

Backlit digitizer tablet

Optical tablet construction