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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Referenced by:
Export Citation:
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 | ||||
| 1865863 | Blackboard | |||
| 1991882 | Blackboard frame construction | |||
| 2517069 | Laminated panel and method of making the same | |||
| 2643466 | Game instruction apparatus | |||
| 2869263 | Display frame having detachable interlocking joints | |||
| 2951299 | Chalkboard surface | |||
| 2968876 | Method and apparatus for displaying conditions of vehicle traffic and accidents incidental thereto | |||
| 3130113 | Self-adhesive decorative surface covering material |
Foreign References:
| GB189205846A |