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| Number | Title | Issue Date |
| 4367874 | Tennis racquet and method of making same A tennis racquet having a polar moment of inertia similar to conventional length racquets, but being longer than conventional racquets with the same or larger size strung surface. Having the same polar moment of inertia as a well playing conventional racq... | 01/11/1983 |
| 4264389 | Method of manufacturing a tennis racket A tennis racket frame is constructed primarily of an elongated tubular member having a wall thereof consisting of a plurality of concentric layers of high tensile strength fibers impregnated and bonded together by binder resin to produce a hollow cored te... | 04/28/1981 |
| 4183776 | Tennis racket manufacture A tennis racket frame is constructed primarily of an elongated hollow tube member having a wall thereof consisting essentially of a plurality of concentric layers of high tensile strength fibers impregnated and bonded together by binder resin, at least tw... | 01/15/1980 |
| 4045025 | Glass fiber tennis racket frame A tennis racket frame is constructed primarily of an elongated hollow tube member having a wall thereof consisting essentially of a plurality of concentric layers of high tensile strength fibers impregnated and bonded together by binder resin, at least tw... | 08/30/1977 |
