Multi-level chessboard

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Description

FIG. 1 is a top plan view of a multi-level chessboard showing my original design;

FIG. 2 is a front elevational view thereof, the back, right side and left side views being a mirror image of this front view;

FIG. 3 is a bottom view of said multi-level chessboard.

Referenced Cited
U.S. Patent Documents
D23036 February 1894 Gardner
D234366 February 1975 Zelenko
3884474 May 1975 Harper
Foreign Patent Documents
667737 March 1952 GBX
Patent History
Patent number: D255910
Type: Grant
Filed: Nov 17, 1978
Date of Patent: Jul 15, 1980
Inventor: Michael D. Bergman (Bonita, CA)
Primary Examiner: Melvin B. Feifer
Attorney: Henri J. A. Charmasson
Application Number: 5/961,584
Classifications
Current U.S. Class: D21/23
International Classification: D2101;