BASEBALL
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United States of America Patent
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app pub date -
Mar 21, 2012
filing date -
Mar 23, 2011
priority date (Note) -
Abandoned
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Abstract
A baseball includes an inner core, and an outer layer covering the outer circumferential surface of the inner core. The inner core has a surface hardness of not less than 60 and not more than 80 in Asker C hardness, and has an elastic modulus of not less than 0.6 MPa and not more than 1.0 MPa. In this way, a baseball can be obtained which can achieve a trajectory comparable to that of a ball for hardball after hitting and which can achieve an impact force comparable to a ball for rubber-ball baseball.
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