| Patent Number |
Title Of Patent |
Date Issued |
| 5665942 |
Optical-scanning system employing laser and laser safety control |
September 9, 1997 |
| An optical-scanning system including a laser, a multi-faceted, rotational scanning mirror, and system-monitoring laser safety structure operatively and informationally connected respectively to the laser and to the mirror and the drive motor for the mirror for altering the effective powe |
| 5623129 |
Code-based, electromagnetic-field-responsive graphic data-acquisition system |
April 22, 1997 |
| An electromagnetic-field-responsive (preferably optical), code-based, graphic data-acquisition system for tracking the operational status of a mobile write-effective component (stylus, eraser, etc.) in relation to a defined writing-surface area. The preferred embodiment features an activ |
| 5585605 |
Optical-scanning system employing laser and laser safety control |
December 17, 1996 |
| An optical-scanning system including a laser, a multi-faceted, rotational scanning mirror, and system-monitoring laser safety structure operatively and informationally connected respectively to the laser and to the mirror and the drive motor for the mirror for altering the effective powe |
| 5583323 |
Calibration of graphic data-acquisition tracking system |
December 10, 1996 |
| A system and method for calibrating and monitoring the height of an electromagnetic radiation expanse above a writing surface is described. An electromagnetic-radiation-generating structure is disposed adjacent produce an expanse of radiation in a substantially planar zone near the w |
| 5434370 |
Marking system with pen-up/pen-down tracking |
July 18, 1995 |
| A system and method for detecting movement of an object along an axis normal to a planar surface is described. The invention is applied to a graphic data-acquisition system in which a digitized record is produced according to the X, Y and Z location of a writing implement relative to a |
| 5248856 |
Code-based, electromagnetic-field-responsive graphic data-acquisition system |
September 28, 1993 |
| An electromagnetic-field-responsive (preferably optical), code-based, graphic data-acquisition system for tracking the operational status of a mobile write-effective component (stylus, eraser, etc.) in relation to a defined writing-surface area. The preferred embodiment features an activ |
| 4777329 |
Graphic input system |
October 11, 1988 |
| A graphic input system determining position coordinate data of a mobile element on a writing surface by measuring the transit times of ultrasonic signals and an electromagnetic signal. The mobile element may comprise either a writing instrument or an eraser. The electromagnetic signal |
