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Low-weight two piece golf ballsRelated Patent Categories: Games Using Tangible Projectile, Golf, Ball, Particular Unitary Or Layered ConstructionLow-weight two piece golf balls description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060199667, Low-weight two piece golf balls. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD OF INVENTION [0001] The present invention generally relates to golf balls, and more particularly to a low weight two piece golf ball for golfers with a low club head speed. BACKGROUND OF THE INVENTION [0002] The flight of a golf ball is determined by many factors, but only three factors are typically controlled by the golfer. By impacting the ball with a golf club, the golfer controls the speed, the launch angle and the spin rate of the golf ball. The launch angle sets the initial trajectory of the golf ball's flight. The speed and spin of the ball give the ball lift which will define the ball's overall flight path along with the weight and drag of the golf ball. Where the ball stops after being struck by a golf club also depends greatly on the weather and the landing surface the ball contacts. [0003] Many golfers have what is termed a "low swing speed." This means that the club head speed at impact is relatively slow when compared to a professional golfer's. Typically, when driving a golf ball the average professional golf ball speed is approximately 234 ft/s (160 mph). A person having a low swing speed typically drives the ball at a speed less than 220 ft/s (150 mph). A person with a low swing speed has a low ball speed. Consequently, his or her ball does not fly very far because of the lack of speed and lift. A significant percentage of all golfers today use such low swing speeds and consequently produce drives of less than 210 yards. [0004] Standard balls are optimized for distance at swing speeds generally greater than 90 mph. Standard balls weigh more than 45 grams, while lightweight balls generally weigh less than 44 grams. Typically, lightweight golf balls are designed for low swing speed golfers. These lightweight golf balls usually are two-piece solid balls made with a single-solid core, encased by a hard cover material. The resiliency of the core can be increased so that the compression is high, which in addition to making the balls stiffer, increases the initial velocity and decreases the ball's spin rate. This maximizes the distance achieved by low swing speed players. However, these balls tend to have a hard feel and are difficult to control around the greens. Additionally, these golf balls can have insufficient mass to provide good distance at the target audience. [0005] Golf balls generally include a spherical outer surface with a plurality of dimples formed thereon. Conventional dimples are circular depressions that reduce drag and increase lift. Lightweight golf balls typically have a dimple package tuned for a standard weight golf ball, which results in a ball that flies too high and short. [0006] A need exists for a high performance golf ball designed for low swing speed players, particularly those with a club head speed of less than 90 mph that offers improved distance with superior feel. SUMMARY OF THE INVENTION [0007] The present invention is directed to a golf ball comprising a core and a cover layer surrounding the core. In addition, the golf ball has a weight between about 44.5 grams and 45 grams, a diameter of at least 1.68 inches and a coefficient of restitution of about at least 0.82 at a club head speed of about 100 ft/sec. The golf ball has a dimple pattern to provide optimal trajectory and overall distance. [0008] In one preferred embodiment, the dimple pattern includes dimples having at least three different diameters. The dimples preferably cover at least 80% of the exterior surface. The dimples also preferably have an edge angle greater than 14 degrees to a phantom sphere concentric with and having a same diameter as the exterior surface of the cover. [0009] According to one aspect of the invention, the exterior surface defines between about 200 and about 600 dimples. [0010] According to another aspect of the invention, the plurality of dimples may comprise an aerodynamic coefficient magnitude defined by C.sub.mag= (C.sub.L.sup.2+C.sub.D.sup.2) and an aerodynamic force angle defined by Angle=tan.sup.-1(C.sub.L/C.sub.D), where C.sub.L is a lift coefficient and C.sub.D is a drag coefficient. Additionally, the golf ball may include an outer land surface, wherein the outer land surface comprises at least one first substantially constant width and at least one second substantially constant width, wherein said first and second widths separate the dimples. Additionally, the golf ball may have a first aerodynamic coefficient magnitude from about 0.24 to about 0.27 and a first aerodynamic force angle of about 31 degrees to about 35 degrees at a Reynolds Number of about 230000 and a spin ratio of about 0.085 and a second aerodynamic coefficient magnitude from about 0.25 to about 0.28 and a second aerodynamic force angle of about 34 degrees to about 38 degrees at a Reynolds Number of about 207000 and a spin ratio of about 0.095. [0011] According to another aspect of the invention, the golf ball may have a third aerodynamic coefficient magnitude from about 0.26 to about 0.29 and a third aerodynamic force angle of about 35 degrees to about 39 degrees at a Reynolds Number of about 184000 and a spin ratio of about 0.106. Also, the golf ball may have a fourth aerodynamic coefficient magnitude from about 0.27 to about 0.30 and a fourth aerodynamic force angle of about 37 degrees to about 42 degrees at a Reynolds Number of about 161000 and a spin ratio of about 0.122. [0012] According to yet another aspect of the invention, the golf ball may have a fifth aerodynamic coefficient magnitude from about 0.29 to about 0.32 and a fifth aerodynamic force angle of about 39 degrees to about 43 degrees at a Reynolds Number of about 138000 and a spin ratio of about 0.142 and a sixth aerodynamic coefficient magnitude from about 0.32 to about 0.35 and a sixth aerodynamic force angle of about 40 degrees to about 44 degrees at a Reynolds Number of about 115000 and a spin ratio of about 0.170. [0013] According to yet another aspect of the invention, the golf ball may have a seventh aerodynamic coefficient magnitude from about 0.36 to about 0.40 and a seventh aerodynamic force angle of about 41 degrees to about 45 degrees at a Reynolds Number of about 92000 and a spin ratio of about 0.213 and an eighth aerodynamic coefficient magnitude from about 0.40 to about 0.45 and an eighth aerodynamic force angle of about 40 degrees to about 44 degrees at a Reynolds Number of about 69000 and a spin ratio of about 0.284. [0014] According to another aspect of the invention, a 100 kg load on the golf ball has a deflection of about 3.0 mm to about 4.0 mm. [0015] According to another aspect of the invention, the golf ball preferably has a coefficient of restitution of about 0.83 to about 0.87 at a club speed of about 100 ft/sec, and more preferably a coefficient of restitution of about 0.83 to about 0.85 at a club speed of about 100 ft/sec. According to another aspect of the invention, the golf ball has a coefficient of restitution of about at least 0.82 at a club head speed of about 125 ft/sec. [0016] Preferably, the surface of the core has a Shore C material hardness of between about 50 and about 80. [0017] The cover layer preferably has a thickness less than or equal to about 0.08 inch. [0018] In one embodiment, the cover layer may be formed of a thermoplastic material, and the thermoplastic material may be selected from the group including: partially or fully neutralized ionomers, thermoplastic polyurethane, metallocene, thermoplastic urethane, fusabond, or other single site catalyzed polymer, or blends thereof. [0019] In yet another embodiment, the cover layer is formed of a thermoset material, and the thermoset material may be selected from the group including: aromatic urethane, light stable urethane, light stable polyurea, polyurethane-ionomer or blends thereof. [0020] The cover layer may have a Shore D material hardness of between about 30 and about 75. In another embodiment, the cover layer may have a Shore D material hardness of less than about 60. [0021] The present invention is also directed to a golf ball comprising a core, a cover layer surrounding the core. In addition, the golf ball has a weight between about 44.5 grams and about 45 grams, a deflection at 100 kg of about 3.0 mm to about 4.0 mm, a diameter of at least 1.68 inches, and a coefficient of restitution of about 0.82 to about 0.87 at a club head speed of 100 ft/sec. The golf ball has a plurality of dimples provided on an exterior surface of the cover layer to provide an optimal trajectory and overall distance for the golf ball. Continue reading about Low-weight two piece golf balls... Full patent description for Low-weight two piece golf balls Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Low-weight two piece golf balls patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Low-weight two piece golf balls or other areas of interest. ### Previous Patent Application: Golf ball Next Patent Application: Golf tee with ball elevating members Industry Class: Games using tangible projectile ### FreshPatents.com Support Thank you for viewing the Low-weight two piece golf balls patent info. 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