Multi-layered golf balls containing a dual-core structure are provided. The core structure includes an inner core (center) made from a foam or metal-containing composition, or it has a hollow shell construction, and the outer core layer is made of a thermoplastic composition. Preferably, the thermoplastic composition comprises: a) ethylene acid copolymer, b) plasticizer, and c) cation source. A fatty acid ester such as ethyl oleate is preferably used as the plasticizer. The core assembly preferably has a positive hardness gradient extending across the entire assembly. The core structure and resulting ball have relatively good resiliency at given compressions.

A liquid discharge head includes: an individual channel having an inlet and an outlet, the individual channel including: a nozzle, an upstream-side pressure chamber arranged between the inlet and the nozzle, a downstream-side pressure chamber arranged between the outlet and the nozzle, an upstream-side throttle channel connecting the inlet and the upstream-side pressure chamber, and a downstream-side throttle channel connecting the outlet and the downstream-side pressure chamber; a supply channel connected to the inlet and configured to supply liquid to the individual channel; a recovery channel connected to the outlet and configured to recover the liquid from the individual channel; an upstream-side actuator configured to apply pressure to the liquid inside the upstream-side pressure chamber; and a downstream-side actuator configured to apply the pressure to the liquid inside the downstream-side pressure chamber. The channel resistance of the downstream-side throttle channel is smaller than that of the upstream-side throttle channel.

A method of manufacturing golf balls having a core and a cover of at least one layer encasing the core includes the steps of producing a core by molding and vulcanizing a rubber composition containing (A) a base rubber, (B) an ,-unsaturated carboxylic acid and/or a metal salt thereof, and (C) an organic peroxide; and heat-treating the core for 1 to 24 hours at between 175 and 300 C. Golf balls which undergo little energy loss and have a high initial velocity can be obtained by this method.

A system for locating an electronic game implement such as an electronic golf ball. The electronic game implement has an outer shell and internal core, with the core containing graphene coated electronics and a battery, wherein the associated electronics of the electronic game implement includes a processor and transceiver configured to measure data including acceleration, speed, travel trajectory and final location while also being configured to transmit the measured data via a communications protocol. The ball or sports game implement that includes the associated electronics are also an embodiment of the invention. The system includes a smart device having associated electronics to communicate with the electronic game implement ball, with the associated electronics of the smart device including a processor configured to receive the measured data from the electronics of the electronic game implement.

A sports equipment article comprises a thermoplastic poly(carbonate-siloxane) elastomer.

A small electronic device used to perform alignment of a lined golf ball in preparation for putting. The device is battery powered and includes one or more motors for rotating the golf ball at a high speed. The device further includes one or more photonic line sensors disposed at the golf ball for identifying the line on the golf ball and for communicating with a microcontroller which coordinates the electric rotation motors to align the golf ball to the device. The electronic device also features a mechanical loading mechanism which holds the golf ball for rotation during the alignment process and releases the golf ball to the putting green without rotation when alignment is complete.

A golf ball comprising: (a) a core; (b) at least one mantle layer adjacent to the core; (c) an inner cover layer adjacent to the mantle layer; and (d) an outer cover layer adjacent to the inner cover layer, wherein the inner cover layer has a material Shore D hardness that is at least 3 less than the material Shore D hardness of the outer cover layer, and the inner cover layer has a thickness of less than 0.050 in.

Multi-piece golf balls having a multi-layered solid core and multi-layered cover are provided.

A compressible core with an RFID tag is described. The compressible core comprises an RFID integrated circuit, and an inlay material sandwiched between a top hemisphere and a bottom hemisphere. The RFID integrated circuit includes a memory that stores a unique identifier. The inlay material includes an RFID antenna electrically coupled to the RFID integrated circuit. The top hemisphere of the compressible core is separated from the bottom hemisphere of the compressible core. The inlay with the RFID antenna and the RFID integrated circuit placed between the top and bottom hemispheres. The top hemisphere, the inlay and the bottom hemisphere are joined together forming a compressible core. Additionally, the molded shell encapsulates the compressible core.

An object of the present invention is to provide a golf ball having excellent approach spin performance under a dry condition and excellent approach spin performance under a condition that there is grass between the golf ball and the club face. The present invention provides a golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, wherein the paint film is composed of at least one layer, and an outermost paint film layer located at the outermost layer of the golf ball contains, as a base resin, a polyurethane obtained by a reaction between (A) a polyisocyanate composition and (B) a polyol composition, (B) the polyol composition contains a urethane polyol as a polyol component, and the outermost paint film layer has a dynamic friction coefficient of from 0.65 to 1.2 measured with a dynamic friction tester under specific conditions.