Baseball
US8882617B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 2011 |
| Grant date | Nov 11, 2014 |
| Priority date | — |
| Expiry date | Dec 28, 2031 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B2102/18
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
There is provided a baseball including an inner core, and an outer core covering an outer circumferential surface of the inner core, the inner core being formed to have a dimension of 20% or more and 80% or less of an outer diameter of the inner core and the outer core of the baseball, and having a dynamic viscoelasticity loss coefficient (tan δ) of 0.3 or less, the outer core being formed to have a thickness of 10% or more and 40% or less of the outer diameter of the inner core and the outer core of the baseball, and having an elastic modulus of 1.5 MPa or less. As a result, there can be obtained a baseball that achieves a high level of safety when the baseball hits against a human body and achieves a hit distance equal to and longer than that of a ball for hardball.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.