WO2001037938A2 - Golf ball and method of manufacture - Google Patents
Golf ball and method of manufacture Download PDFInfo
- Publication number
- WO2001037938A2 WO2001037938A2 PCT/US2000/042083 US0042083W WO0137938A2 WO 2001037938 A2 WO2001037938 A2 WO 2001037938A2 US 0042083 W US0042083 W US 0042083W WO 0137938 A2 WO0137938 A2 WO 0137938A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- golf ball
- ball
- core
- inches
- dimple
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B47/00—Devices for handling or treating balls, e.g. for holding or carrying balls
- A63B47/008—Devices for measuring or verifying ball characteristics
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/0022—Coatings, e.g. paint films; Markings
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/0004—Surface depressions or protrusions
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/0004—Surface depressions or protrusions
- A63B37/0006—Arrangement or layout of dimples
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/0004—Surface depressions or protrusions
- A63B37/0012—Dimple profile, i.e. cross-sectional view
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/0004—Surface depressions or protrusions
- A63B37/002—Specified dimple diameter
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/0023—Covers
- A63B37/0029—Physical properties
- A63B37/0033—Thickness
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/005—Cores
- A63B37/0051—Materials other than polybutadienes; Constructional details
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/005—Cores
- A63B37/006—Physical properties
- A63B37/0062—Hardness
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/005—Cores
- A63B37/006—Physical properties
- A63B37/0064—Diameter
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/005—Cores
- A63B37/006—Physical properties
- A63B37/0066—Density; Specific gravity
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/005—Cores
- A63B37/006—Physical properties
- A63B37/0067—Weight; Mass
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/007—Characteristics of the ball as a whole
- A63B37/0072—Characteristics of the ball as a whole with a specified number of layers
- A63B37/0073—Solid, i.e. formed of a single piece
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/007—Characteristics of the ball as a whole
- A63B37/0072—Characteristics of the ball as a whole with a specified number of layers
- A63B37/0074—Two piece balls, i.e. cover and core
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/0003—Golf balls
- A63B37/007—Characteristics of the ball as a whole
- A63B37/0072—Characteristics of the ball as a whole with a specified number of layers
- A63B37/0075—Three piece balls, i.e. cover, intermediate layer and core
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B37/00—Solid balls; Rigid hollow balls; Marbles
- A63B37/02—Special cores
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B45/00—Apparatus or methods for manufacturing balls
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B45/00—Apparatus or methods for manufacturing balls
- A63B45/02—Marking of balls
Definitions
- This invention is directed towards golf balls and is directed more particularly to a golf ball having a unique carbide ceramic core, a unique dimple configuration, and having indicia or other markings which indicate a balance point for the golf ball.
- a significant number of conventional golf balls are made by molding a cover about a core having a typical core diameter of about 1 -1 /2 inches.
- One form of golf ball construction includes balls having a solid core. Solid core golf balls are referred to generally as "two-piece" golf balls.
- the core of a two-piece golf ball is based upon rubber compositions which are formulated to provide high hardness, high compressive strength, durability, and excellent rebound properties. Such rubber core formulations provide resiliency to the resulting golf ball which optimizes initial velocity at impact and promotes long flight distance qualities.
- Polybutadiene elastomers are commonly used for the rubber component of a core and are cross linked by chemical cross-linking agents to increase the hardness while maintaining good resiliency. It is well known within the art in the manufacturing processes and formulations for which conventional two-piece golf ball cores may be manufactured .
- One representative patent includes US Patent No. 5,508,350 which is incorporated herein by reference.
- core constructions which provide high initial velocity to the resulting golf ball while maintaining the durability of the core. Should the integrity of the core be compromised by cracking or other core damage, the ball will suffer a loss of initial velocity. The degradation in ball performance may be gradual and may not be immediately apparent to the user. Accordingly, cores which retain their durability will extend the useful performance life of the golf ball.
- a small 5 degree off set from a line through the center of the ball in the direction of the putting stroke can result in a misdirection on a 4 foot putt to 2.1 inches which is sufficient to miss the cup.
- the missed distance from the cup is, of course, greater as the distance of the putt increases.
- the placement of the indicia is determined by floating golf ball in a solution having a specific gravity which will float the ball.
- the heaviest portion of unbalanced ball "settles" beneath the brine solution.
- the uppermost surface of the floating ball is then marked for subsequent labeling with an appropriate indicia.
- the ball may be placed with the heaviest portion making contact with the putting green.
- the ball has a tendency to roll truer.
- the ball has surface markings which are placed opposite the heaviest point of the golf ball.
- Figures 1 A and 1 B are cross section views through a two- piece golf ball illustrating different embodiments of the rubber core construction.
- Figure 2 is a sectional view of a single dimple which illustrates an embodiment of the invention.
- Figure 3 is a dimple trace pattern of golf balls having a dimple edge radius and shape in accordance with the present invention.
- Figures 4A and 4B are perspective views illustrating a process of weight balancing and marking a golf ball so that a balance point on the golf ball may be readily determined.
- the golf ball according to the present invention is produced from a polymer having high cis-polybutadiene rubber.
- polybutadiene rubber is produced from using various kinds of catalysts which are well known in the art. Additional polymers, such as natural rubber, may be added and other polymers may be added or substituted as is appreciated by one having ordinary skill in the art.
- Metal salts of unsaturated carboxcylic acids are used to cross link the polymers.
- Suitable carboxcylic acids include methacrylic, acrylic, dimethacrylic, and diacrylic acids.
- Suitable metal ions include sodium, potassium, magnesium, cerium, zinc, and cadmium, with zinc being preferred.
- a carbide ceramic such as boron carbide or silicon carbide are introduced to the polymer composition.
- These ceramics have a high specific stiffness and a high Youngs modulus. Specifically, 2 to 25 per cent by weight of the ceramic is introduced in the polymer mix.
- the ceramic is provided in the form of a fine particulate having an average particle size from about 4 microns to about 500 microns. This size also correlates to mesh sizes ranging from about 800 mesh to about a 35 mesh size of the particulate.
- a carbide ceramic particulate size of about 220 grit has been found useful. More preferably, the ceramic is added at a range of between 10 to 20 per cent by weight; and, in one preferred composition set forth below, is present between 8.5 to 9 per cent by weight.
- the carbide ceramic results in a core for a two-piece golf ball which has a high initial velocity property and which maintains its durability over time.
- various ceramics selected from the group of nitride, oxide, boride, carbide, and suicide ceramics may also be used to bring about an improved core formulation and resulting composition.
- the ceramic additives serve as a damping agent to the core such that the core and associated golf ball undergoes less compression when struck with force by a club head. As a result, the golf ball returns to its initial size more quickly and contributes to a high initial velocity and accuracy of the ball.
- the free radical initiator included in the core composition may be selected from a variety of known polymerization initiators. Preferably, the initiator decomposes during the cure cycle.
- One useful initiator set forth in the table below is dicumyl peroxide and used in amounts from about 1 .0 to about 5.0 parts by weight based on 100 parts elastomer.
- Zinc oxide is used as an activator as well as a filler.
- Zinc oxide is present in the formulation in an amount from about 3 to about 5 parts per weight based upon 100 parts elastomer.
- Metal salts of unsaturated carboxaylic acid such as zinc diacrylate (ZDA) may be present in an amount of about 20-40 parts by weight based upon 100 parts elastomer.
- a polybutadiene rubber BR1 208 is combined with a natural rubber, CV60, in a Banbury or internal mixer.
- a natural rubber CV60
- ZDA zinc diacrylate
- the remaining portion of the zinc diacrylate is added along with the barium sulphate and the boron carbide. Additional blending is carried out for two minutes during which time the mix temperature rises to about 1 70°F. At this point, zinc stearate and the dicumyl peroxide activators are added to the polymer blend along with additional mixing for about one and one-half minutes. During this latter step, the temperature rises to about 1 90°F and care must be exercised that the temperatures do not exceed 1 95°F. Following the additional mixing of one and one-half minutes or the elevation of the temperature to 195°F, a dump cycle is carried out in which the composition is placed into a conventional drop mill.
- the drop milling process brings about an immediate reduction in temperature of the polymer composition and generates thin sheets of one-quarter to one-half inch thick slabs of the core polymer mixture.
- the resulting preforms of individual rubber slugs are subsequently cured by heating the compositions on the order of from about 275 °F to about 350°F with the molding of the composition brought about simultaneously with the curing step.
- the molding of the composition into a core structure may be used by any conventional molding techniques such as injection, compression, or transfer molding procedures.
- the core is removed from the mold and the surface is treated by any of several techniques known in the art such as centeriess grinding or surface peeling method and the like so as to facilitate adhesion of a covering composition.
- the core is provided with at least one layer of a covering composition ranging in thickness from about 0.050 to about 0.250 inches and more preferably from about 0.060 to about 0.090 inches.
- a covering composition ranging in thickness from about 0.050 to about 0.250 inches and more preferably from about 0.060 to about 0.090 inches.
- the resulting cores produced according to the present invention provide a golf ball having a high initial velocity. Further, it has been found that the durability of the core is enhanced by the carbide ceramic additive such that the durability of the core is enhanced.
- one embodiment provides a golf ball 2 having a cover 6 and a core 4.
- the golf ball cover has the ceramic or ceramic additive 8 uniformly distributed throughout the core composition.
- Microscopic analysis of cores made in accordance with this invention reveal that the outer 50% radius of the core defines a gradient of the ceramic additive which is 1 5 to 20 per cent greater than the inner core region. This gradient is believed to be established during the cooling of the rubber core following molding. The resulting gradient is believed to contribute to the useful properties of the core and resulting golf ball and provide additional benefits of a perimeter weighted ball.
- a golf ball core may be seen in reference to Fig. 1 B.
- a smaller inner core 10 is provided of a conventional core polymer mixture which does not have the carbide ceramic or advanced ceramic additive.
- a second core 12 is molded from the polymer composition set forth in Table 1 .
- this arrangement provides an outer core region 1 2 which is perimeter weighted with the carbide ceramic or advanced ceramic additives.
- the perimeter weighting of the core of either embodiment results in a golf ball having a lower spin rate. This, in turn, equates to a golf ball having a greater flight distance. It is believed that the carbide ceramics or advanced ceramic additives described above will offer similar improvements in a wide range of conventional rubber core compositions.
- the cores described above may be used with any conventional cover to achieve desired performance values.
- any conventional cover may be found in reference to US Patent No. 5,538,794 which is incorporated by reference. This patent, along with the references therein, may be used to provide covers suitable for use with the present core composition.
- golf balls having both one-piece and two-piece cores were manufactured and evaluated.
- the balls produced were found to have a core weight of about 35.0 ⁇ 0.3 grams with a core size of 1 .510 ⁇ 0.005 inches.
- the ATTI compression values range between about 70 to about 80 and have a Shore D hardness values of 50 ⁇ 3.
- the core compositions of the present invention may additionally include other conventional modifying ingredients such as fillers, metal oxides, and various cross-linking agents.
- filler amounts are primarily based upon weight restrictions and specific gravity requirements of the total polymer composition in the range from about 1 5 to about 30 parts by weight on 100 parts elastomer.
- An additional aspect of the present invention is to provide a golf ball exhibiting an improved putting performance during soft, low impact putts.
- Traditional golf balls have a tendency to be deflected from the intended line of travel when the putter face impacts the ball along a dimple edge.
- the dimple edge contact changes the direction of travel of the golf ball. For instance, a deflection of 5 degrees may cause a deviation along the intended line of travel sufficiently great that a four to five foot putt may be missed.
- the present invention addresses this problem by providing a golf ball having dimples with edges with an edge radii of about 0.050 inches to about 0.250 inches and more preferably ranging between 0.750 inches to about 0.1 50 inches. It has been found that by providing a dimple edge radii in the above ranges to the golf ball, the angle of deflection which results from hitting a dimpled edge may be reduced from 5 degrees to between 1 to 2 degrees. This increase in dimple edge radii, along with a commiserate reduction in the surrounding land area of the golf ball, permits a more accurate and reproducible putt to occur. Further, by making the change to substantially all the dimples on the golf ball it does not require any alignment of a selected portion of the golf ball as taught within the art.
- a single dimple 20 is illustrated in cross section through cover material 6.
- a land area 22 Surrounding dimple 20 is a land area 22.
- a transition region 24 between the dimple 20 and land area 22 which defines a radius as described above.
- the dashed lines in Fig. 2 indicate the referenced circle from which the radius is determined.
- the effect of increasing the dimple edge radii on the balls was initially evaluated by placing a conventional commercial golf ball having an average dimple radii of about 0.025 inches into a surface finishing vibratory device.
- An abrasive media was used to uniformly remove a portion of the outer cover.
- the vibratory process thereby reduced the land area and increased the radius of the dimple edges.
- the removal process was concentrated on the outer dimple wall adjacent the land area in that the transition area between the dimple and the land area was subject to the greatest abrasive action.
- the effectiveness of the vibratory process was confirmed using a dimple tracing device as is well known within the art and as seen in Fig. 3. From the dimple tracing data as set forth in Fig. 3, the angles of deflection of the various balls during putting were determined in which the improvements stated above were noted.
- the desired dimple edge radii and pattern may be directly molded into the golf ball cover using conventional techniques. Changes to the dimple pattern and dimple depth may also be made as needed to bring about other beneficial changes to the golf ball cover that may affect flight distance and trajectory of the golf ball. For any particular ball construction, it is possible to use routine experimentation to alter the radii of the dimple edge and evaluate the alteration upon the deflection angle during putting. Once the desired radii for a particular golf ball is known, a suitable mold can be constructed for commercial production of the balls.
- An additional aspect of the present invention which may be combined with one or more aspects of the other inventive aspects described herein, is directed towards providing a ball which is marked during the manufacturing process with a proper balancing orientation.
- a golf ball will have a balance point which can be determined by floating the ball within a liquid medium such as a brine solution. When floated, the ball will assume a floated position in which the heavier hemisphere will be positioned beneath the water line of the floating ball.
- a floating solution 50 is provided in which the solution has a specific gravity sufficient to float the golf ball 2.
- the ball is placed above a jig 52 which allows the ball to float.
- the jig 52 is in further communication with a plurality of upright arms 54 which provide a cage-like structure to hold and retain the ball in proper position.
- the jig and arm arrangement has tight tolerances tailored to the individual balls to minimize movement of the ball during the marking process.
- the heaviest portion of the ball When floated, the heaviest portion of the ball (the balance point) will position itself to be the lower most point beneath the surface of the solution.
- the jig 52 and arm 54 may thereafter be slowly elevated to maintain the floating orientation of the golf ball.
- an overhead punch 56 may be applied to the uppermost surface of the golf ball so as to make a permanent reference mark or puncture within the cover of the ball.
- a pivoting arm 60 may be used to lift the ball within the jig 52 and support arms 54 in a substantially vertical manner so as to engage a sharp point on a terminal end of punch 56. It is preferred to use a sharp point so as to make a small, permanent marking within the cover which will provide a permanent reference point following subsequent cleaning and surface preparation of the ball cover.
- One of the finishing steps may then include providing a marking or other indicia on the ball corresponding to the previously made mark.
- the golf ball By locating the heaviest point of the ball in one position, it allows the golf ball to be marked on the opposite end with an indicia or other marking. This allows the ball to be oriented for putting such that the ball can be oriented with the heaviest portion making contact with the putting green. In this manner, when the ball is putted, the ball has a tendency to roll truer. If a ball is oriented with the heaviest equator along a side of the ball, the slight imbalance will have a tendency to cause the ball to deviate from the intended path. As a result, by knowing the balance position of the ball enables one to orient the ball for putting such that a more accurate and consistent putt results.
- a truer putting ball can be provided by the process of locating the heavier portion of a ball, marking the opposite end of the ball, and subsequently using the marking to position the golf ball for a putting stroke in which the heaviest end of the ball makes contact with the putting green.
- the ball when struck, the ball has a tendency to roll truer than if the heavier portion or hemisphere of the ball was positioned along an edge of the golf ball.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU45051/01A AU4505101A (en) | 1999-11-09 | 2000-11-09 | Golf ball and method of manufacture |
US10/130,002 US6884181B1 (en) | 1999-11-09 | 2000-11-09 | Golf ball and method of manufacture |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16419799P | 1999-11-09 | 1999-11-09 | |
US60/164,197 | 1999-11-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001037938A2 true WO2001037938A2 (en) | 2001-05-31 |
WO2001037938A3 WO2001037938A3 (en) | 2001-12-27 |
Family
ID=22593408
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/042083 WO2001037938A2 (en) | 1999-11-09 | 2000-11-09 | Golf ball and method of manufacture |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU4505101A (en) |
WO (1) | WO2001037938A2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5971870A (en) * | 1997-11-21 | 1999-10-26 | Sullivan Michael J | Golf ball with soft core |
US6204331B1 (en) * | 1993-06-01 | 2001-03-20 | Spalding Sports Worldwide, Inc. | Multi-layer golf ball utilizing silicone materials |
-
2000
- 2000-11-09 WO PCT/US2000/042083 patent/WO2001037938A2/en active Application Filing
- 2000-11-09 AU AU45051/01A patent/AU4505101A/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6204331B1 (en) * | 1993-06-01 | 2001-03-20 | Spalding Sports Worldwide, Inc. | Multi-layer golf ball utilizing silicone materials |
US5971870A (en) * | 1997-11-21 | 1999-10-26 | Sullivan Michael J | Golf ball with soft core |
Also Published As
Publication number | Publication date |
---|---|
WO2001037938A3 (en) | 2001-12-27 |
AU4505101A (en) | 2001-06-04 |
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