The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 1994
Filed:
Aug. 26, 1992
Michael P Biggs, Westlake Village, CA (US);
Takeo Z O'Ishi, Los Angeles, CA (US);
Mark S Knighton, Santa Monica, CA (US);
Other;
Abstract
A computer data input device is provided which is characterized by a wireless pen for moving over the surface of a tablet. The pen will simultaneously emit magnetic pulses and ultrasonic pulses. The tablet will be equipped with a magnetic detection coil and two microphones. The magnetic detection coil will nearly instantaneously detect the magnetic pulse and serve as a time reference for determining the time it takes to detect the ultrasonic pulses. The detection circuitry will detect a specific point within the ultrasonic pulse and the time travel of the sonic pulse to the two microphones will be used to determine the distance of the pen from the two microphones yielding the position of the pen over the surface of the tablet.