Tennis racket
Patent 4165071 Issued on August 21, 1979. Estimated Expiration Date: 
August 21, 1996. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 21, 1996. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorApplicationNo. 05/646848 filed on 01/05/1976US Classes:473/521, For racket or paddle264/221, With destruction of pattern or mold to dissociate264/317, Removing mold by destruction473/537, Having dimensional characteristic or other parameter specified by a number, numeric variable, or mathematical formula (e.g., location of center of gravity, elastic modulus of a string, weight of racket, etc.)73/65.03, Ball driving sporting implement (e.g., golf club, baseball bat, etc.)73/65.07DynamicExaminersPrimary: Apley, Richard J.International ClassesA63B 49/02 (20060101)A63B 49/00 (20060101) A63B 59/00 (20060101) AbstractA tennis racket is provided having the same swing weight as rackets of the prior art, but having a significant reduction in the weight, and a significant increase in the distance of the center of percussion and in the distance of the center of gravity from the end of the handle. A significant reduction in the deflection and vibration of the racket caused by the impact of the ball is provided. The tendency of the racket to turn in the players hand when a ball hits the racket off of the longitudinal axis of the racket, is reduced.These improvements are accomplished by controlling the distribution of material and the cross-sectional shape along the length, width, and depth of the racket, and by the utilization of materials having a high stiffness and strength per unit weight.Methods are provided to measure the swing weight of the racket about selected axes and to measure the flexibility and vibratory characteristics of the racket.Other References
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