Tennis racket

Details Tennis racket Tennis racket

2007-05-15

2007-05-15

Chiu, Raleigh W. (Department: 3711)

Games using tangible projectile

Player held and powered, nonmechanical projector, per se,...

Racket or paddle; accessory therefor

C473S521000, C473S539000

Reexamination Certificate

active

10967296

ABSTRACT:
A tennis racket having a racket frame defining a ball-hitting face, wherein if the upper part of the ball-hitting face is set as a 0-degree position, a string protection member is mounted on at least one portion of a head part of the racket frame in a range from a clockwise 45-degree position to a clockwise 135-degree position and in a range from a clockwise 225-degree position to a clockwise 315-degree position by interposing a viscoelastic member between the string protection member and the racket frame. The moment (Is) of inertia of the tennis racket in a swing direction is set to not less than 450,000 g/cm2nor more than 490,000 g/cm2, when strings are not tensionally mounted thereon. The moment (Ic) of inertia of the tennis racket in a center direction is set to not less than 15,000 g/cm2nor more than 19,000 g/cm2, when the strings are not tensionally mounted thereon.

REFERENCES:
patent: 5165687 (1992-11-01), Soong
patent: 5368297 (1994-11-01), Liu
patent: 6293878 (2001-09-01), Iwatsubo et al.
patent: 6530851 (2003-03-01), Munster
patent: 2002/0058557 (2002-05-01), Kanemitsu
patent: 2005/0192128 (2005-09-01), Takeuchi et al.
patent: 2000-300698 (2000-10-01), None
patent: 2003-175134 (2003-06-01), None

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