Wilson Sporting Goods Co.

Skil Corporation

William E Dillon

Frank M Simonutti

David A Vogel

Robert T Thurman

Chloe J Lee

Alex F Gawron

Peter R Tolley

Jerry Matheny

A tennis ball including 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 elastomeric hollow core. The spherical hollow core has an initial internal pressure of no greater than 5 psi. The tennis ball has a first tennis ball rebound height when measured at a first time when the tennis ball is unused and a second tennis ball rebound height measured after the tennis ball is exposed to atmospheric pressure for four months following the first time and is unused. The second tennis ball rebound height being at least 96% of the first tennis ball rebound height.

Tennis ball

A tennis ball including a spherical core. The spherical core including an outer surface and a raised wall integrally molded as part of the outer surface.

Tennis ball having a thermoplastic core

A method for forming a tennis ball including the steps of providing a non-foamed thermoplastic core and providing a non-smooth textured surface on the core. The thermoplastic core including a thermoplastic material having a specific gravity of 0.86 to 1.38, a flexural modulus of 2.0 to 50.0 MPa, and a Shore D hardness of 10 to 70. The thermoplastic material having a thickness between 3.0 and 8.0 mm. The thickness of the thermoplastic material being configured to maintain dimensional stability at internal pressures of between zero and 15 psi.

A tennis ball including a non-foamed thermoplastic core defining an internal volume. The core includes a thermoplastic material having a specific gravity of 0.86 to 1.38, a flexural modulus of 2.0 to 50.0 MPa, and a Shore D hardness of 10 to 70. A thickness of the thermoplastic material is between 3.0 and 8.0 mm. The thickness of the thermoplastic material is configured to maintain dimensional stability at internal pressures of between zero and 15 psi.

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.

A tennis ball comprises a hollow elastic circumferential core defining a primary outer surface pattern, and a textile outer layer extending over and about the core.

Tennis ball having a core with aerodynamic patterns

A tennis ball may include a spherical hollow core having an inner surface including material shift lines and a textile outer layer over and about the core.

Tennis ball having a core with internal material shift lines

Pickle ball

A pressureless tennis ball comprises a novel core which is formed from a compound containing rubber and a plastomer defined as a copolymer of ethylene and one or more alkenes.

Pressureless tennis ball

A power tool includes manually operated selector means for alternately establishing rotary-hammer and hammer-only modes of operation for the associated drill bit. The attachment is in the form of an elongated member having a longitudinally extending blind bore for receiving the drill bit; retaining means are provided for releasably mounting the attachment on the drill bit. An annular shoulder defining the mouth of the blind bore is in abutting engagement with another annular shoulder, the latter being arranged to receive impact blows from the hammer mechanism of the power tool. In one embodiment, this second mentioned annular shoulder is constituted by a tappet forming part of the hammer mechanism. In another embodiment, this second mentioned annular shoulder is an integral part of the drill bit. Impact blows are transmitted to the attachment only through the area of engagement of the aforesaid annular shoulders. In one embodiment, the attachment has its working end in the form of a blunt end cylinder adapted to install concrete anchors. In another embodiment, the working end of the attachment is in the form of a chisel.

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Chicago, IL, United States of America

William E Dillon