Patent ID: 7018311

Claim:
A method of making a construction liner for an American football having a cover skin, comprising the steps of: (a) cutting a rubber sheet material into at least an elliptical rubber piece having a predetermined size; (b) cutting a fabric sheet material into at least an elliptical fabric lining having a size at least equal to that of said rubber piece; (c) compressing and vulcanizing said rubber piece with said fabric lining together in a press mold, so as to unite said rubber piece with said fabric lining integrally to form a compressed and vulcanized integral rubber-based fabric liner; and (d) cutting said integral rubber-based fabric liner to a predetermined size to form said construction liner after said integral rubber-based fabric liner is cooled down to room temperature wherein said construction liner is adapted for overlapping on an inner surface of said cover skin for supporting said cover skin to form a ball cover so as to control a stiffness of the American football.