Henry G. Matthews

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Haddam, CT, US

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Patents Grantslast 30 patents

Information Patent Grant
Digitizer stylus with pressure transducer
- Patent number RE34095
- Issue date Oct 13, 1992
- Summagraphics Corporation
- Michael J. Padula
- 178 - Telegraphy
Information Patent Grant
Method and apparatus for calibration of a charge ratio digitizer
- Patent number 4,831,566
- Issue date May 16, 1989
- Summagraphics Corporation
- Henry G. Matthews
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Method of and apparatus for controlling a display
- Patent number 4,794,388
- Issue date Dec 27, 1988
- Summagraphics Corporation
- Henry G. Matthews
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Menu for a charge ratio digitizer
- Patent number 4,788,386
- Issue date Nov 29, 1988
- Summagraphics Corporation
- Henry G. Matthews
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Digitizer stylus with pressure transducer
- Patent number 4,786,764
- Issue date Nov 22, 1988
- Summagraphics Corporation
- Michael J. Padula
- G06 - COMPUTING CALCULATING COUNTING