Title:
Mathematical teaching block
United States Patent D338929


Inventors:
Stone, Robert J. (Swavesey, GB)
Application Number:
07/539056
Publication Date:
08/31/1993
Filing Date:
06/15/1990
Assignee:
E J Arnold & Son Limited (West Bridgeford, GB2)
Primary Class:
Other Classes:
D21/504
Field of Search:
D21/108, D21/124, D21/141, D21/59, D19/59, D19/62, 446/103, 446/120, 446/121, 446/124, 446/125, 434/191, 434/208, 434/403
View Patent Images:
US Patent References:
5000713Combinable toy blocksMarch, 1991Cheng446/120
4606732Interlocking toy building blocks with interconnecting, releasable hingesAugust, 1986Lyman446/120
D281183Toy construction pieceOctober, 1985KatoD21/108
4026065Polyhedral elements with undercut recesses and cylindrical connectors having collarsMay, 1977Dick446/121
3662486POLYHEDRAL AMUSEMENT AND EDUCATIONAL DEVICEMay, 1972Freedman446/120
2093341Building block setSeptember, 1937Reiche446/124
1216840N/AFebruary, 1917Ramsey446/124



Primary Examiner:
Ansher, Bernard
Assistant Examiner:
Barkai R.
Attorney, Agent or Firm:
Warnecke, Michael O.
Ruff, Deborah S.
Claims:
1. The ornamental design for a mathematical teaching block, as shown anddescribed.

Description:

FIG. 1 is a plan view of a mathematical teaching block showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational being a mirror image;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a sectional view thereof along the lines 6--6 in FIG. 4.