Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5173793 | Liquid crystal shutter for backlit digitizer | — | 1992-12-22 |
| 5153386 | Digitizer tablet with illuminable working surface | David A. Siefer | 1992-10-06 |
| 5109141 | Digitizer stylus with z-axis side control | — | 1992-04-28 |
| 5065145 | Method and apparatus for producing signals corresponding to the position of a cursor | — | 1991-11-12 |
| 5061828 | Digitizer stylus with Z-axis side pressure control | — | 1991-10-29 |
| 5028744 | Digitizer with illuminable working surface | David A. Siefer | 1991-07-02 |
| 5004871 | Digitizer stylus having side switch | — | 1991-04-02 |
| 5001306 | Distributed optical fiber device for digitizer tablet | — | 1991-03-19 |
| 4999462 | Position determining and digitizing method and device | — | 1991-03-12 |
| 4977315 | Liquid crystal position determining system and wand device | — | 1990-12-11 |
| 4952757 | Low-power electromagnetic digitizer tablet | Thomas Zalenski | 1990-08-28 |
| 4943689 | Backlit digitizer tablet | David A. Siefer | 1990-07-24 |