Trackball

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Description

FIG. 1 is a top plan view of a trackball showing our new design;

FIG. 2 is an end elevational view of one end;

FIG. 3 is an end elevational view of the other end;

FIG. 4 is a bottom plan view;

FIG. 5 is a side elevational view of one side; and

FIG. 6 is a side elevational view of the other side.

Referenced Cited
U.S. Patent Documents
4538476 September 3, 1985 Luque
4612539 September 16, 1986 Hosogoe et al.
Other references
  • Computer Design, Jun. 1980, p. 21, upper right, Trackball.
Patent History
Patent number: D289306
Type: Grant
Filed: Nov 16, 1984
Date of Patent: Apr 14, 1987
Assignee: Wico Distribution Company, L.P. (Niles, IL)
Inventors: Philip J. Burnstein (Skokie, IL), Syng N. Kim (Hoffman Estates, IL)
Primary Examiner: Melvin B. Feifer
Law Firm: Emrich & Dithmar
Application Number: 6/672,345
Classifications
Current U.S. Class: D21/48; D13/32; D14/114