Pencil sharpener

Details Pencil sharpener Pencil sharpener

2007-04-17

2007-04-17

Albert, Elizabeth A. (Department: 2913)

Office supplies; artists and teachers materials

Office equipment not elsewhere specified

Perforating or cutting

Design Patent

active

29231765

CLAIM:
The ornamental design for a pencil sharpener, as shown and described.

REFERENCES:
patent: D169980 (1953-07-01), Knapp
patent: 3980113 (1976-09-01), Birdsall
patent: D339536 (1993-09-01), Ribron
patent: D358476 (1995-05-01), Winkos
patent: D373799 (1996-09-01), Doi et al.
patent: D394693 (1998-05-01), Koutsouflakis
patent: D412344 (1999-07-01), Clark
patent: D461857 (2002-08-01), Hornsby et al.
patent: D494624 (2004-08-01), Danon

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