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| Number | Title | Issue Date |
| 4214753 | Transparent article An example of the shock resistant transparent polymer sphere is a billiard or pool ball. The molding apparatus includes lower and upper mold halves defining juxtaposed concave hemispherical surfaces to define a spherical mold cavity with a top fill openin... | 07/29/1980 |
| 4182737 | Molding of a shock resistant transparent polymer sphere An example of the shock resistant transparent polymer sphere is a billiard or pool ball. The molding apparatus includes lower and upper mold halves defining juxtaposed concave hemispherical surfaces to define a spherical mold cavity with a top fill openin... | 01/08/1980 |
| 4157805 | Molding apparatus for a composite billiard ball An example of the shock resistant transparent polymer sphere is a billiard or pool ball. The molding apparatus includes lower and upper mold halves defining juxtaposed concave hemispherical surfaces to define a spherical mold cavity with a top fill openin... | 06/12/1979 |
