Trackball for a computer


FIG. 1 is a top, front, right side perspective view of a trackball for a computer showing my new design;

FIG. 2 is a top plan view thereof on a greatly enlarged scale;

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

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof.

Referenced Cited
U.S. Patent Documents
D288930 March 24, 1987 Barbera et al.
D291318 August 11, 1987 Kim
D292600 November 3, 1987 Wagner
D302010 July 4, 1989 McLaughlin et al.
Patent History
Patent number: D315552
Type: Grant
Filed: Dec 22, 1989
Date of Patent: Mar 19, 1991
Assignee: Curtis Manufacturing Company, Inc. (Jaffrey, NH)
Inventor: James E. Sacherman (Palo Alto, CA)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Freda S. Nunn
Attorney: Richard P. Crowley
Application Number: 7/455,739
Current U.S. Class: D14/114