Blackboard eraser and dust collecter

Details Blackboard eraser and dust collecter Blackboard eraser and dust collecter

2005-05-17

2005-05-17

Holtje, Martie K. (Department: 2913)

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Eraser

Design Patent

active

D0505157

CLAIM:
The ornamental design for a blackboard eraser and dust collecter, as shown and described.

REFERENCES:
patent: 3986224 (1976-10-01), Yang
patent: 4204298 (1980-05-01), Handa et al.
patent: 4462134 (1984-07-01), Wang
patent: 4742594 (1988-05-01), Chen
patent: 4941225 (1990-07-01), Liao
patent: D366670 (1996-01-01), Huh
patent: 6772472 (2004-08-01), Wang

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