Telegraphy – Systems – Position coordinate determination for writing
Patent
1980-11-10
1982-03-02
Robinson, Thomas A.
Telegraphy
Systems
Position coordinate determination for writing
340709, G08C 2100, G08B 2300
Patent
active
043179568
ABSTRACT:
A telautograph system allows a user at one location to write on a special surface, such as a chalkboard, and have the image appear at remote screens. Presently, a user wishing to call attention to an entry already written on the board must make a new line or must circle the item to which the remote viewer's attention is to be drawn. This procedure unduly clutters the image and a system has been devised which provides for a cursor (a graphical hand) to appear on the remote screen when the user touches the input surface at a point. The cursor also appears when the user is writing on the surface so as to call attention to the newly formed images. When pressure on the writing surface is released the cursor remains on the remote screen for a finite period and then automatically disappears, leaving the image unencumbered. When information is being removed from the input surface a graphical eraser appears at the remote screen at the site of the removed information.
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patent: 3609749 (1971-09-01), McClelland
patent: 3651508 (1972-03-01), Scarborough, Jr. et al.
patent: 3706850 (1972-12-01), Fisher et al.
patent: 3739347 (1973-06-01), Forsberg
patent: 3852721 (1974-12-01), Tucker et al.
patent: 3949391 (1976-04-01), Benjamin
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patent: 4125743 (1978-11-01), O'Boyle et al.
Torok Gabor P.
White Andrew B.
Bell Telephone Laboratories Incorporated
Robinson Thomas A.
Tannenbaum David H.
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