Purcell; Alexander M.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Purcell; Alexander M..The latest application filed is for "liquid crystal shutter for backlit digitizer".
- Purcell; Alexander M. - Guilford CT
- Purcell; Alexander M. - Wallingford CT
| Patent | Date |
|---|---|
| Liquid crystal shutter for backlit digitizer Grant 5,173,793 - Purcell December 22, 1 | 1992-12-22 |
| Digitizer tablet with illuminable working surface Grant 5,153,386 - Siefer , et al. * October 6, 1 | 1992-10-06 |
| Digitizer stylus with z-axis side control Grant 5,109,141 - Purcell April 28, 1 | 1992-04-28 |
| Method and apparatus for producing signals corresponding to the position of a cursor Grant 5,065,145 - Purcell November 12, 1 | 1991-11-12 |
| Digitizer stylus with Z-axis side pressure control Grant 5,061,828 - Purcell October 29, 1 | 1991-10-29 |
| Digitizer stylus having side switch Grant 5,004,871 - Purcell April 2, 1 | 1991-04-02 |
| Distributed optical fiber device for digitizer tablet Grant 5,001,306 - Purcell March 19, 1 | 1991-03-19 |
| Position determining and digitizing method and device Grant 4,999,462 - Purcell March 12, 1 | 1991-03-12 |
| Liquid crystal position determining system and wand device Grant 4,977,315 - Purcell December 11, 1 | 1990-12-11 |
| Low-power electromagnetic digitizer tablet Grant 4,952,757 - Purcell , et al. August 28, 1 | 1990-08-28 |
| Backlit digitizer tablet Grant 4,943,689 - Siefer , et al. July 24, 1 | 1990-07-24 |
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