U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Tennis racket

Patent 3999756 Issued on December 28, 1976. Estimated Expiration Date: Icon_subject December 28, 1993. 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 References

801246

1539019

2164631

3086777

3305235

3515386

3545756

3801099

3820785

3917267

Inventor

Assignee

Application

No. 612076 filed on 09/10/1975

US 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.)

Examiners

Primary: Apley, Richard J.

Attorney, Agent or Firm

Abstract

The 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.

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