Games using tangible projectile – Golf – Ball
Reexamination Certificate
1998-09-04
2001-05-22
Chapman, Jeanette (Department: 3711)
Games using tangible projectile
Golf
Ball
C473S384000
Reexamination Certificate
active
06234917
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a golf ball.
2. Description of the Related Art
Conventionally in a golf ball, plural kinds of dimples have been disposed on a spherical face in various design patterns for improving the flying ability of the golf ball. Furthermore, a great circle zone not crossing the dimples, namely, a seam line is on a position of the spherical face corresponding to a parting line of a metal mold for production of the golf ball.
The existence of the seam line, however, is a cause of aerodynamic asymmetry of the golf ball. That is to say, it is known that relatively great differences are generated in flying distance and flight time when the rotating direction (flying direction) of the ball corresponds to the seam line and when the rotating direction of the ball corresponds to a circumferential direction at right angles with the seam line. Therefore, it has been the aerodynamic symmetry of the golf ball by forming many great circle zones not crossing the dimples similar to the seam line on the spherical face, for example, a golf ball of geometrical high uniformity, in which a spherical face is divided with polyhedrons or quasi-polyhedrons, and dimples are disposed line-symmetrically in spherical polygons (Japanese Patent Provisional Publication No. 8-10355).
In a golf ball having many great circle zones on a spherical face, however, there is a defect in that flying distance decreases due to remarkable reduction of dimple effect because of the high probability of correspondence of a rotating direction of the golf ball and a direction of the great circle zone (not having dimples). Furthermore, there is another problem in that the degree of freedom of design is very low because there are a limited number of patterns which can divide the sphere with polyhedrons or quasi-polyhedrons, and the dimple disposition is line-symmetric in the spherical polygons. Therefore, the dimple disposition still needs to be improved.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a golf ball in which stable flying ability can be obtained by improved aerodynamic symmetry, and degree of freedom in designing dimple disposition is high. Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 5092604 (1992-03-01), Oka
patent: 5156404 (1992-10-01), Oka et al.
patent: 5415410 (1995-05-01), Aoyama
patent: 5735756 (1998-04-01), Stiefel
patent: 5902193 (1999-05-01), Shimosaka
patent: 8-10355 (1996-01-01), None
Birch & Stewart Kolasch & Birch, LLP
Blau Stephen L.
Chapman Jeanette
Sumitomo Rubber Industries Ltd.
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