US2025269242A1PendingUtilityA1
Golf ball
Est. expiryFeb 22, 2044(~17.6 yrs left)· nominal 20-yr term from priority
Inventors:Hideo Watanabe
A63B 37/0051A63B 37/0082A63B 37/0092A63B 37/0063A63B 37/00215A63B 37/009A63B 37/0089A63B 37/0087A63B 37/0084A63B 37/0074A63B 37/0017A63B 37/0096
60
PatentIndex Score
0
Cited by
0
References
0
Claims
Abstract
A golf ball includes a core and a cover, in which a large number of dimples are formed on an outside surface of the cover, the cover is formed using an ionomer resin as a chief material, an initial velocity of the ball is set within a predetermined range, a deflection when a predetermined load is applied to the ball is set within a predetermined range, a relationship of a ratio to a lift coefficient/drag coefficient at a Reynolds number of 218,000 and a spin rate of 2,800 rpm, a lift coefficient/drag coefficient at a Reynolds number of 184,000 and a spin rate of 2,900 rpm, and a lift coefficient/drag coefficient at a Reynolds number of 158,000 and a spin rate of 3,100 rpm is specified, and a volume occupancy ratio of the dimples is set within a predetermined range.
Claims
exact text as granted — not AI-modified1 . A golf ball comprising a core and a cover, wherein a large number of dimples are formed on an outside surface of the cover, the cover is formed of an ionomer resin as a chief material, an initial velocity of the ball is from 76.0 to 77.724 m/s, and a deflection when the ball is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) is not more than 3.8 mm, and when a ratio CL1/CD1 of a lift coefficient CL1 at a Reynolds number of 218,000 and a spin rate of 2,800 rpm to a drag coefficient CD1 is denoted by A1, a ratio CL2/CD2 of a lift coefficient CL2 at a Reynolds number of 184,000 and a spin rate of 2,900 rpm to a drag coefficient CD2 is denoted by A2, and a ratio CL3/CD3 of a lift coefficient CL3 at a Reynolds number of 158,000 and a spin rate of 3,100 rpm to a drag coefficient CD3 is denoted by A3, the following two conditions are satisfied:
0.59
≤
A
1
≤
0
.
6
55
and
(
A
2
+
A
3
)
/
2
≥
0
.
6
7
0
and a volume occupancy ratio VR of the dimples is from 0.75 to 0.89%.
2 . The golf ball according to claim 1 , wherein a value of A1 is from 0.590 to 0.613, a value of A2 is from 0.635 to 0.668, and a value of A3 is from 0.695 to 0.734.
3 . The golf ball according to claim 1 , wherein a value of A1 is from 0.614 to 0.655, a value of A2 is from 0.669 to 0.750, and a value of A3 is from 0.735 to 0.815.
4 . The golf ball according to claim 1 , wherein a value of (A2+A3)/2 is from 0.670 to 0.783.
5 . The golf ball according to claim 1 , wherein when a total volume of the dimples is denoted by D (mm 3 ), and a deflection when the ball is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) is denoted by B (mm), the following condition is satisfied:
1
0
0
≤
D
/
B
≤
1
4
0
.
6 . The golf ball according to claim 1 , wherein the core has a hardness profile in which, letting Shore C hardness at a core center be Cc, Shore C hardness at a midpoint M between the core center and a core surface be Cm, Shore C hardnesses at positions 2 mm, 4 mm, and 6 mm inward from the midpoint M be Cm−2, Cm−4, and Cm−6 respectively, Shore C hardnesses at positions 2 mm, 4 mm, and 6 mm outward from the midpoint M be Cm+2, Cm+4, and Cm+6 respectively, and Shore C hardness at the core surface be Cs, and defining surface areas A to F as follows:
surface area A: ½×2×(Cm−4−Cm−6)
surface area B: ½×2×(Cm−2−Cm−4)
surface area C: ½×2×(Cm−Cm−2)
surface area D: ½×2×(Cm+2−Cm)
surface area E: ½×2×(Cm+4−Cm+2)
surface area F: ½×2×(Cm+6−Cm+4)
the following condition is satisfied:
{
(
surface
area
D
+
surface
area
E
)
-
(
surface
area
A
+
surface
area
B
)
}
≥
4.
.
7 . The golf ball according to claim 6 , wherein the core has a hardness profile in which the following condition is satisfied:
(
Cs
-
Cc
)
≥
2
2
.
8 . The golf ball according to claim 6 , wherein the core has a hardness profile in which the following condition is satisfied:
(
Cs
-
Cc
)
/
(
Cm
-
Cc
)
≥
4
.
0
.
9 . The golf ball according to claim 6 , wherein the core has a hardness profile in which the following condition is satisfied:
surface area E>surface area D>surface area C.
10 . The golf ball according to claim 1 , wherein the core is formed of a rubber composition containing the following components (A) to (D):
(A) a base rubber, (B) an organic peroxide, (C) water or a monocarboxylic acid metal salt, and (D) sulfur.
11 . The golf ball according to claim 1 , wherein a relationship between a surface hardness of the core and a surface hardness of the ball satisfies the following condition:
(ball surface hardness)>(core surface hardness) (where hardness means Shore C hardness).
12 . The golf ball according to claim 1 , wherein a difference between a specific gravity of the core and a specific gravity of the cover is within ±0.10.Join the waitlist — get patent alerts
Track US2025269242A1 — get alerts on status changes and closely related new filings.
We store only your email — no account needed. See our privacy policy.