Education and demonstration – Means for demonstrating apparatus – product – or surface... – Chalkboard or equivalent means having easily erasable surface
Patent
1986-09-02
1989-01-10
Picard, Leo P.
Education and demonstration
Means for demonstrating apparatus, product, or surface...
Chalkboard or equivalent means having easily erasable surface
358256, 358285, H04N 1024
Patent
active
047971061
ABSTRACT:
An electronic blackboard system capable of using an existing white board or blackboard which may even be one that is already installed on a wall.
REFERENCES:
patent: 4587568 (1986-05-01), Takayama et al.
patent: 4609946 (1986-09-01), Thaler
patent: 4725889 (1988-02-01), Yaniv et al.
Sakai Katsuyoshi
Umehara Seiji
Mitsubishi Denki & Kabushiki Kaisha
Picard Leo P.
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