The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 1990
Filed:
Jul. 06, 1989
Applicant:
Inventor:
Hansan Ma, Cape Elizabeth, ME (US);
Assignee:
Tonka Corporation, Minnetonka, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A63B / ;
U.S. Cl.
CPC ...
273 / ; 273 / ; 273 / ; 273 / ; 273D / ; 273D / ;
Abstract
A ball for throwing having a generally spherical shape and balance has an axis, first and second convex surfaces defined about the axis at opposite poles, and at least one groove having a non-uniform depth defined in the surface of the ball between the first and second convex surfaces. The groove is arranged to extend through the equatorial region of the ball, between the first and second convex surfaces.