Patent ID: 11951360
Assignee: WILSON SPORTING GOODS CO.
Field: Furniture, games (Other fields)
Classification: CPC A | IPC A

Claim 13:
14. A tennis ball comprising:
a spherical hollow elastomeric core formed of at least one thermoplastic material and at least one rubber, the 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 fist 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;
wherein the tennis ball has a rebound height, measured after the tennis ball is exposed to atmospheric pressure for four months following the first time and is unused, that satisfies United States Tennis Association and International Tennis Federation standardized rebound height specifications as published by the International Tennis Federation as of Jul. 1, 2018.