Appeal No. 2004-0242 Page 4
Application No. 09/873,594
13. A golf ball comprising;
a core;
an inner cover layer disposed on said core comprising an ionomer resin;
and
an outer cover layer disposed about said inner cover layer comprising a
polyurethane material.
Teachings of Nesbitt
Nesbitt's invention relates to a golf ball and more particularly to a cover
construction for a golf ball. In the BACKGROUND ART section of the patent (column 1,
lines 9-33), Nesbitt teaches:
Golf balls having a cover material marketed under the trademark "Surlyn"
by E. I. du Pont de Nemours and Company of Wilmington, Del., are known in the
art and such cover compositions generally comprise a copolymer of an olefin and
at least one unsaturated monocarboxylic acid. Conventional two-piece golf balls
are comprised of a solid resilient center or core with molded Surlyn covers. The
cover used is normally a hard, high flexural modulus Surlyn resin in order to
produce a gain in the coefficient of restitution over that of the center or core.
In a conventional two-piece golf ball, a hard, high flexural modulus Surlyn
resin is molded over a resilient center or core. The hard, highly flexural modulus
Surlyn resin for the cover of a two-piece golf ball is desirable as it develops the
greatest hoop stress and consequently the greatest coefficient of restitution.
A two-piece golf ball having a hard, Surlyn resin cover however does not
have the "feel" or playing characteristics associated with softer balata covered
golf balls. Heretofore balata covered golf balls have been preferred by most golf
professionals. If a golf ball has a cover of soft, low flexural modulus Surlyn resin
molded directly over a center or core, it is found that little or no gain in coefficient
of restitution is obtained.
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Next
Last modified: November 3, 2007