Abstract: The present invention is a golf ball which has a spherical surface which is integrally provided with a plurality of annular ridges. The annular ridges are effective for reducing the air resistance of the ball in flight and thus drastically improving the flight performance. Further, at least some of the annular ridges may intersect with each other, including those which have an equal size.

Abstract: A golf club (40) having a club head (42) with a face component (60), an aft body (61) and a gasket (300) is disclosed herein. The face component (60) has a striking plate portion (72) and a return portion (74). The aft-body (61) is preferably composed of a crown portion (62), a sole portion (64) and optionally a ribbon section (90). The gasket (300) controls the face angle of the club head (42). The width of the gasket (300) varies to provide an open face angle club head, a closed face angle club head, or a neutral face angle club head (42). The club head (42) preferably has a volume in the range of 290 cubic centimeters to 600 cubic centimeters, a weight in the range of 165 grams to 300 grams, and a striking plate portion (72) surface area in the range of 4.00 square inches to 7.50 square inches.

Abstract: A new configuration for at least some of the dimples on the surface of a golf ball is characterized by undercut portions in the concave surface thereof. The undercut dimples have a first diameter at the surface of the golf ball and a second diameter beneath the surface which is greater than the first diameter. Thus, a portion of the ball surface overhangs an annular portion of the dimple at the periphery thereof. The undercut portions create additional turbulence at the surface of the golf ball as it flies through the air to improve the aerodynamic efficiency of the dimples, thereby reducing drag and increasing the distance the ball will travel when struck.

Abstract: The present invention relates to a golf club head having multiple undercuts. The club head includes a body defining a striking face, a top line, a sole, and a back, and having a heel and a toe. The back contains a cavity. Multiple undercuts in the form of a plurality of recesses are provided within the cavity. The recesses extend away from the cavity. The recesses may be oriented in a variety of ways. In a first arrangement, the recesses are aligned longitudinally to the striking face in a heel-to-toe direction. In a second arrangement, the recesses are recesses are aligned transverse to the striking face in a front-to-back direction and extend in a heel-to-toe direction. In a third arrangement, the plurality of recesses includes both longitudinally arranged and transversely arranged recesses. An insert, such as a weight insert, a dampening insert, or a combination insert, is preferably positioned within each of the recesses.

Abstract: This invention relates to a multi-layered, multi-piece golf ball that comprises a core, an intermediate layer, and a cover, wherein the core comprises a spherical body and ribs that are arranged on the surface of the spherical body and that have almost the same height as the thickness of the intermediate layer, wherein the intermediate layer fills a plurality of concave portions formed on the surface of the spherical body while being surrounded by the ribs. This arrangement enables the golf ball to have both high ball bounce resilience and a soft feel when hit.

Abstract: A golf ball with a precise spin rate is disclosed. The distribution of weight among the layers within the golf ball relative to a centroid radius is realized to precisely control the moment of inertia of the ball. In accordance to one aspect of the present invention, a high spin rate golf ball with a dense center, which is positioned radially inside of the centroid radius, and a low specific gravity mantle is provided. In accordance to another aspect of the present invention, a low spin rate golf ball with an inner core and a thin dense layer disposed radially outside of the centroid radius is provided.

Abstract: A golf ball includes a core, an intermediate layer and a cover. The core is formed of a first composition, the intermediate layer is formed of a second composition, and the cover is formed of a third composition. The specific gravity of each of the first, second and third compositions are generally equal to each other. The first, second, and third compositions are each sufficiently mixed such that the ball exhibits random orientation when floated in a solution of sufficient density to support the ball.

Abstract: A golf club head includes a body having a cavity in a rear side thereof, a striking plate provided on a front side of the body, and a vibration-absorbing plate fixed in the cavity of the body and not in contact with the striking plate. The damping effect of the golf club head and gripping comfort are improved.

Abstract: A multi-piece golf ball includes a core having a diameter of 30 to 40 mm, at least one intermediate layer including the outermost layer having a thickness of 0.5 to 2.0 mm, and a cover having a thickness of 1.0 to 3.0 mm. The cover is made from a material obtained by dispersedly blending at least one kind of silicone powder selected from a silicone rubber powder, a silicon resin powder, and a composite powder thereof, in a main resin component containing an ionomer resin in an amount of 50% by weight or more. Dimples of the number of 300 to 550 pieces are formed in the surface of the golf ball in such a manner that a dimple total volume ratio VR is in a range of 0.85% or less. The multi-piece golf ball is excellent in resilience, flight distance characteristic, and feel of hitting.

Abstract: A golf teaching and training device including a frame adapted to extend upwardly from a playing surface and a pair of pivotable arms extending away from the frame in a spaced relationship from the base of the frame and adapted to prevent an over-the-top golf swing. A track associated with the frame includes a slide to which a putter club may be releasably secured for allowing a golfer to practice his/her putting stroke. A mat may also be adapted to be seated beneath the frame and includes golf ball placement markings positioned generally below the arm of the device and corresponding foot placement markings spaced selected distances from the respective golf ball placement markings.

Abstract: A golf ball with at least one moisture vapor barrier layer is disclosed. The moisture vapor barrier layer comprises an elastomer, and has a moisture vapor transmission rate of less than about 0.6 grams·mm/m2·day.

Abstract: A method of manufacturing a golf club head comprises: making a billet of a titanium alloy Ti-6Al-4V by machining an ingot of the titanium alloy; forging the billet into a face plate within a temperature range of from (the beta transformation temperature ?150 degrees C.) to (the beta transformation temperature ?20 degrees C.); and jointing the face plate and a head main body, whereby the golf club head comprise a face portion for hitting a ball, at least part of which is made of an alpha and beta type titanium alloy Ti-6Al-4V including alpha phase crystal structure whose average grain size is not less than 20 micrometers but less than 70 micrometers.

Abstract: A golf training device for improving a golfer's swing having a weighted contoured head that provides for proper feel of a mechanically correct golf swing. The device emulates a golf club having an elongated hollow shaft with an upper end grip end portion and a weighted contoured head at its oppositely disposed bottom end. The weighted contoured head has a flat bottom with an enlarged contoured upstanding toe end portion in longitudinally spaced relation to the shaft engagement portion. The toe end portion defines a center of gravity outwardly and beyond the lower profile of the main body member allowing the golfer to swing through in a natural beneficial manner.

Abstract: A method for increasing adhesion between golf ball layers comprising the steps of providing a golf ball layer having a first surface; preparing the first surface for treatment; exposing the first layer to a silane; providing a second golf ball layer; and adhering the second layer to the first via the silane. Additionally, a golf ball including an inner component, a molecular monolayer, and at least one cover layer, wherein the inner component and the at least one cover layer have differing surface energies and the cover layer is adhered to inner component with the molecular monolayer.

Abstract: A golf club (40) having a club head (42) with a face component (60) and an interchangeable aft body (61) is disclosed herein. The face component (60) has a striking plate portion (72) and a return portion (74). The aft-body (61), which is attached to the return portion (74) of the face component (60), is selected from a plurality of aft-bodies, each having a different center of gravity location. Each of the aft-bodies (61) is composed of a crown portion (62), a sole portion (64), and at least one weight member (122) for adjusting location of the center of gravity. An aft-body (61) is selected from the plurality of aft-bodies (61) based on its center of gravity location, so as to provide the club head (40) with a center of gravity location suited to a particular golfer.

Abstract: A golf club head having a cavity back arrangement and a sandwich construction is disclosed. The club head contains a thin strike face, a metal back flange and a light weight insert located between the strike face and the back flange to provide structural support to the strike face. The insert is in contact with at least a portion of the strike face and is made from light weight materials including magnesium and titanium. The club head is constructed to move the center of gravity lower and toward the back of the club head and to increase the moment of inertia. The insert provides the necessary support with adversely affecting either the center of gravity or the moment of inertia.

Abstract: A golf club with hollow construction, having a lowered center of gravity while retaining its inherent features such as a large moment of inertia and a deep position of the center of gravity. A head 1 comprises a face portion 10 for forming a face 3; a head body 11 including a shaft connecting portion 8 and a frame portion 15 joined to a rear peripheral surface of the face portion 10; a rear shell 12 joined to a rear peripheral surface of the frame portion 15. The rear shell 12 forms a hollow portion 17 together with the face portion 10 and the head body 11. The head 1 further includes a balance weight 13 joined to the rear shell 12 on the hollow portion 17 side. Therefore, there can be provided a golf club in which a miss hit leads to a less likelihood of unsuccessful consequence, so that it is easy to use even for beginners.

Abstract: A golf ball comprising a core and a cover disposed about the core, wherein the core comprises a center and at least one outer core layer adjacent the center, and the cover comprises at least one inner cover layer and an outer cover layer, wherein the center has an outer diameter from about 0.375 in to about 1.4 in and deflection of greater than about 4.5 mm under a load of 100 Kg, the outer core layer has an outer diameter of from about 1.4 in to about 1.62 in, the inner cover layer has an outer diameter of greater than about 1.58 in and a material hardness of less than about 72 Shore D, and the outer cover layer has a hardness of greater than about 50 Shore D.

Abstract: In a multi-piece solid golf ball comprising a solid core, an intermediate layer, and a cover, the solid core is formed mainly of an organosulfur compound-containing base rubber, the intermediate layer is formed mainly of a base resin containing at least 50% by weight of a polyurethane elastomer, the cover is formed mainly of a polyurethane elastomer, and the Shore D hardnesses of the layers are controlled. The golf ball has excellent travel distance and feel as well as improved scuff resistance and durability to repeated impact.

Abstract: A perimeter weighted golf ball with a low compression core is provided. The core preferably comprises a diene polymer that has low cross-link density or not cross-linked with a reactive co-agent. This core has low compression and low specific gravity. The low specific gravity core is encased within a thin dense layer positioned outside of the centroid radius to provide the ball with a high moment of inertia. The same core can be encased within a plurality of intermediate layers having either increasing hardness or decreasing hardness to provide selective golf balls for either low swing speed players or advanced players. Alternatively, a thin layer of diene polymer highly cross-linked with reactive a co-agent may be incorporated into the ball to increase the hardness of the ball.