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US 10,918,913 B2Granted
Tennis ball
AssigneeWilson Sporting Goods Co.
InventorsWilliam E. Dillon, Frank M. Simonutti
Life of this patent
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Abstract
A tennis ball may include a spherical hollow elastomeric core having a specific gravity of less than 1 and a thickness of at least 4.5 mm and a textile layer covering the spherical hollow core.
Claims16
A tennis ball comprising:
- a spherical hollow elastomeric core having a specific gravity of less than 1 and a thickness of at least 4.5 mm, the spherical hollow core has an initial internal pressure of no greater than 5 psi;
- and
- a textile layer covering the spherical hollow core,
- wherein the tennis ball has a first tennis ball coefficient of restitution value of at least 0.53 when measured from an initial velocity of 90 feet/second at a first time when the tennis ball is unused, and
- wherein the tennis ball has a second tennis ball coefficient of restitution value measured from an initial velocity of 90 feet/second after the tennis ball is exposed to atmospheric pressure for four months following the first time and is unused, and
- wherein the second coefficient of restitution value is at least 95 percent of the first coefficient of restitution value.
3 more elements
Dependencies are inferred from the claim text.