Curve ball
Patent 4919422 Issued on April 24, 1990. Estimated Expiration Date: 
July 6, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 6, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorAssigneeApplicationNo. 376317 filed on 07/06/1989US Classes:473/613Having fluid-dynamic means other than stitched seam or textured surface to alter, stabilize, or retard passage of projectile through the fluid (e.g., spiral fluting to impart spin, etc.)ExaminersPrimary: Marlo, George J.Attorney, Agent or FirmInternational ClassesA63B 037/1460 A 60 B 26 R AbstractA 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.Field of SearchBall, bell, or star-shaped | |
