US2025073537A1PendingUtilityA1
Golf ball
Est. expiryAug 28, 2043(~17.1 yrs left)· nominal 20-yr term from priority
A63B 37/0068A63B 37/004A63B 37/0029A63B 37/0091A63B 37/0087A63B 37/0035A63B 37/0064A63B 37/0033A63B 37/0065A63B 37/0084A63B 37/0045A63B 37/0043A63B 37/0066A63B 37/0076A63B 37/00773A63B 37/0075A63B 37/0047A63B 37/0039A63B 37/0031
50
PatentIndex Score
0
Cited by
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References
0
Claims
Abstract
In a golf ball having a core, a cover and at least one intermediate layer formed therebetween, the core, intermediate layer and cover have respective specific gravities with a standard deviation of not more than 0.07 or less, the cover has a material hardness on the Shore D hardness scale of 52 or less, and the ball has a deflection when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) which is 2.8 mm or less. The amount of deviation in the ball center of gravity is exceedingly small, increasing the straightness with which the ball rolls on putts with a putter.
Claims
exact text as granted — not AI-modified1 . A golf ball comprising a core, a cover and at least one intermediate layer formed therebetween, wherein the core, intermediate layer and cover have respective specific gravities with a standard deviation of 0.07 or less, the cover has a material hardness on the Shore D hardness scale of 52 or less and the ball has a deflection when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) which is 2.8 mm or less.
2 . The golf ball of claim 1 wherein, letting CM be the specific gravity of the core, MM be the specific gravity of the intermediate layer, FM be the specific gravity of the cover, CV be the initial velocity of the core, MV be the initial velocity of the sphere obtained by encasing the core with the intermediate layer (intermediate layer-encased sphere) and FV be the initial velocity of the ball, which is the sphere obtained by encasing the intermediate layer-encased sphere with the cover, the ball satisfies formula (1) below
(
C
M
×
C
V
)
+
(
M
M
×
M
V
)
+
(
F
M
×
FV
/
FC
)
>
200
(
1
)
[the initial velocity values for the core and the intermediate layer-encased sphere being values measured using an initial velocity instrument of the same type as a USGA drum rotation-type initial velocity tester, and the initial velocity value for the ball being a value measured using a COR-type initial velocity instrument of the same type as a R&A tester].
3 . The golf ball of claim 1 , wherein the ball has a moment of inertia of from 82.5 to 85.0 g·cm 2 .
4 . The golf ball of claim 1 , wherein letting CM be the specific gravity of the core, MM be the specific gravity of the intermediate layer, FM be the specific gravity of the cover, CV be the initial velocity of the core, MV be the initial velocity of the sphere obtained by encasing the core with the intermediate layer (intermediate layer-encased sphere), FV be the initial velocity of the ball, which is the sphere obtained by encasing the intermediate layer-encased sphere with the cover, and MOI be the moment of inertia of the ball, the ball satisfies formula (2) below
(
C
M
×
CV
/
MOI
)
+
(
M
M
×
M
V
)
+
(
F
M
×
FV
/
FC
)
>
110.
(
2
)
5 . The golf ball of claim 1 , wherein the specific gravities of the core, the intermediate layer and the cover are all from 1.10 to 1.13 g/cm 3 .
6 . The golf ball of claim 1 , wherein the specific gravities of the intermediate layer and the cover satisfy the following relationship:
−0.03≤(specific gravity of intermediate layer-specific gravity of cover)≤0.03.
7 . The golf ball of claim 1 , wherein the intermediate layer is formed of a layer which includes barium sulfate as a specific gravity modifier.
8 . The golf ball of claim 1 , wherein the intermediate layer has a material hardness on the Shore D hardness scale of 60 or more.
9 . The golf ball of claim 1 , wherein the cover has a material hardness on the Shore D hardness scale of 40 or more.Join the waitlist — get patent alerts
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