On Mon, 14 Jul 2003, Feldman, Robert wrote:
There were plans published in BYTE (IIRC) for just
such a digitizer. I
don't remember the issue, but the time frome would have been early
1980's.
Yep
That's why I say:
it was so obvious that MANY people must have done so)
The patentable "invention" would not be the overall concept, but merely
what methods were chosen to implement it. For example, Mimio with
transmitters in marking pen holders, and a receiver that suction cupped to
a white board.