Didactic toy for mathematics

Details Didactic toy for mathematics Didactic toy for mathematics

2007-03-27

2007-03-27

Delehanty, Robert A. (Department: 2914)

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

Design Patent

active

29240976

CLAIM:
I claim the ornamental design for a didactic toy for mathematics, as shown and described.

REFERENCES:
patent: D184396 (1959-02-01), Jenkins
patent: 3339295 (1967-09-01), Wanvig
patent: D252758 (1979-08-01), Prall
patent: D388461 (1997-12-01), Smith et al.
patent: 5699631 (1997-12-01), Tyson
patent: 5865627 (1999-02-01), Foresman
patent: D444176 (2001-06-01), Leslie
patent: D502964 (2005-03-01), Cziraky

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