Patent References 801246 1539019 2164631 3086777 3305235 3515386 3545756 3801099 3820785 3917267 InventorAssigneeApplicationNo. 612076 filed on 09/10/1975US Classes:473/537, 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.)473/539Elongated string-hole liner (e.g., grommet, bushing, etc.)ExaminersPrimary: Apley, Richard J.Attorney, Agent or FirmAbstractThe tennis racket has a strung surface which is larger than the strung surface of a conventional racket, particularly in regard to its dimension in a longitudinal direction from the frame tip toward the handle shaft of the racket. The conventional length, weight, and balance which have proven necessary for good playing characteristics for all tennis rackets of the past have been maintained. The racket has unexpectedly achieved increased strength and a combination of advantages in playing characteristics without resort to weights, springs, or other complications previously proposed. The racket has a zone of high coefficient of restitution, much larger than that of conventional rackets, extending in a longitudinal direction from the region of the center of percussion to a point 11/4 inch from the throat of the racket, thereby taking maximum advantage of the location of the center of percussion of the racket. The zone of high coefficient of restitution is also wider with respect to the corresponding zone on conventional rackets. | |