Perpetual calendar calculator

Details Perpetual calendar calculator Perpetual calendar calculator

2000-05-04

2001-11-20

Mortimer, Paula A. (Department: 2912)

Office supplies; artists and teachers materials

Calendar or calendar holder

Combined

Design Patent

active

D0450762

CLAIM:
The ornamental design for a perpetual calendar calculator, as shown and described.

REFERENCES:
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patent: D. 442210 (2001-05-01), Chan
patent: 3800454 (1974-04-01), Anderson
patent: 4187629 (1980-02-01), Yamada
patent: 4611995 (1986-09-01), Sado
patent: 4793634 (1988-12-01), Alloggiamento
patent: 4813707 (1989-03-01), Habib
patent: 4828290 (1989-05-01), Harris
patent: 5560127 (1996-10-01), Thomas

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