Ring binder having a torsionally stiffened blade

Details Ring binder having a torsionally stiffened blade Ring binder having a torsionally stiffened blade

2000-12-20

2001-09-18

Mortimer, Paula A. (Department: 2912)

Office supplies; artists and teachers materials

Book, album or cover

Ring bound or looseleaf type

Design Patent

active

D0448045

CLAIM:
The ornamental design for ring binder having a torsionally stiffened blade, as shown and described.

REFERENCES:
patent: D. 389182 (1998-01-01), Law
patent: D. 389183 (1998-01-01), Chan
patent: D. 397146 (1998-08-01), Chan
patent: D. 405113 (1999-02-01), Ko
patent: D. 430898 (2000-09-01), To
patent: 2612169 (1952-09-01), Segal
patent: 5788390 (1998-08-01), Law
patent: 5788391 (1998-08-01), Cheung
patent: 5807006 (1998-09-01), Cheung
patent: 5810500 (1998-09-01), Whaley
patent: 5836709 (1998-11-01), Cheung
patent: 5868513 (1999-02-01), Law
patent: 6109813 (2000-08-01), To et al.

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