Graphic input system

Details Graphic input system Graphic input system

1987-08-24

1988-10-11

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

340706, 434408, G08C 2100

Patent

active

047773294

ABSTRACT:
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 contains information that represents the color of ink used in the writing instrument and identifies the portion of the eraser in contact with the writing surface.

REFERENCES:
patent: 3838212 (1974-09-01), Whetstone et al.
patent: 3886311 (1975-05-01), Rodgers et al.
patent: 3904822 (1975-09-01), Kamm et al.
patent: 4012588 (1977-03-01), Davis et al.
patent: 4289927 (1981-09-01), Rodgers
patent: 4492819 (1985-01-01), Rodgers et al.
patent: 4616106 (1986-10-01), Fowler et al.
patent: 4711977 (1987-12-01), Miyamori et al.

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