Office supplies; artists and teachers materials – Equipment for writing – drawing – or for fine arts – Writing or drawing surface – e.g. – blackboard – drawing board,...
Patent
1994-08-16
1996-04-02
Thompson, Martie
Office supplies; artists and teachers materials
Equipment for writing, drawing, or for fine arts
Writing or drawing surface, e.g., blackboard, drawing board,...
D20 10, D16237, D19100
Patent
active
D03684911
REFERENCES:
patent: 93120 (1869-07-01), Pritchard
patent: D116692 (1939-09-01), Joyce et al.
patent: D265486 (1982-07-01), Lundell et al.
patent: 2102905 (1937-12-01), MaGee
patent: 2303181 (1942-11-01), Thomas
patent: 3528731 (1970-09-01), Bird
patent: 4803564 (1989-02-01), Sakai
Two photographs of a clap board which was in public use and on sale in the United States as early as Aug. 7, 1993.
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