Curve ball
US4919422A · kind A · utility
36Cited by
17References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1989 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Jul 6, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S273/20
- WIPO fieldFurniture, games
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.