Integrated string
AssigneeE. I. Du Pont de Nemours and Company
InventorsJoseph Tracy Rivers, Jr., Joe Dennis Zaharko
Life of this patent
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Abstract
A string suitable for use in game rackets such as for tennis contains from two to four heavy denier monofilaments of an oriented synthetic polymer. Each monofilament has at least two opposite flattened sides throughout its length. The monofilaments are ply-twisted and bonded together along their lengths with each being bonded along a flattened side to at least one other such monofilament. Particularly suitable monofilaments have a substantially ribbon-shaped cross-section with a length-to-width ratio of from two to four.
Claims10
An integrated string comprised of from 2 to 4 monofilaments of an oriented, synthetic, thermoplastic polymer, with each monofilament having a denier of 2,000 to 8,000 and having at least two opposite flattened sides throughout its length, said monofilaments having substantially no individual twist and being ply-twisted and bonded together throughout the length of the string with each said monofilament being bonded along a flattened side to at least one other of said monofilaments.
An integrated string consisting essentially of from 2 to 4 monofilaments of an oriented, synthetic polycarbonamide, with each monofilament having a denier of 2,000 to 8,000 and having throughout its length a substantially uniform cross-section with two opposite flattened sides and length-to-width ratio of from 2 to 4, said monofilaments having substantially no individual twist and being ply-twisted and bonded together throughout the length of the string with the ply-twist being from about 0.4 to about 1.2 turns per cm., and said monofilaments being aligned with each other so that each one is bonded along at least one of its flattened sides to at least one other of said monofilaments.
Dependencies are inferred from the claim text.