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US 11,890,531 B2Granted
Maintenance method of bowling ball, plasticizer
OwnerYutaka Yamadainventor
Life of this patent
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Abstract
The purpose of the present invention is to provide a maintenance method for restoring the flexibility of a surface layer of a bowling ball in which the flexibility of the surface layer is lost by volatilization or elution of a plasticizer. In order to solve the above-mentioned problems, a maintenance method of bowling ball is provided, characterized in that a plasticizer is applied to a surface layer of the bowling ball.
Claims8
A bowling ball treatment method comprising, the following steps of:
- preparing a bowling ball;
- and
- applying a plasticizer is applied to an outer peripheral surface layer of the bowling ball prepared in the step of preparing the bowling ball, without forming a resin layer on the outer peripheral surface layer.
Dependencies are inferred from the claim text.