Graphic communication apparatus
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United States of America Patent
Stats
-
Sep 15, 1981
Grant Date -
N/A
app pub date -
Nov 13, 1979
filing date -
Nov 13, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Graphic communication apparatus for electronically writing information and transmitting includes a pen having a pair of windings disposed in a predetermined angular relation with respect to each other, and a writing surface having a plurality of windings arranged substantially parallel to each other for sensing the presence of the pen from the magnetic fields of the pen coils to provide differential outputs over the writing surface with respect to the windings of the pen apparatus, and the differential outputs being located with respect to the writing surface in an X--Y orientation.
First Claim
Family
International Classification(s)
Cited Art Landscape
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