Title:
BLACKBOARD
Document Type and Number:
United States Patent 3432944

Inventors:
Ishida, Toyo
      Plaque It!

Sponsored by:
Flash of Genius
Publication Date:
03/18/1969
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Assignee:
Toyo, Ishida
Primary Class:
Other Classes:
434/425
International Classes:
B43L1/06; B43L1/00; B43L1/04; B43L1/10
US Patent References:
0086177
0467561
0572004
1865863Blackboard
1991882Blackboard frame construction
2517069Laminated panel and method of making the same
2643466Game instruction apparatus
2869263Display frame having detachable interlocking joints
2951299Chalkboard surface
2968876Method and apparatus for displaying conditions of vehicle traffic and accidents incidental thereto
3130113Self-adhesive decorative surface covering material
Foreign References:
GB189205846A




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