ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,415,902, issued on Sept. 16, was assigned to SUMITOMO RUBBER INDUSTRIES LTD. (Kobe, Japan).
"Adhesive for tennis ball" was invented by Takehiko Hyodo (Kobe, Japan), Yuko Kujirai (Kobe, Japan) and Kazuyoshi Shiga (Kobe, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An adhesive for a tennis ball of the present disclosure includes base rubber and a filler. The base rubber contains, as a main component thereof, liquid rubber having a number average molecular weight of not less than 10,000. The filler has an average nitrogen specific surface area of not less than 40 m2/g. A tennis ball of the present disclosure includes a hollow core made of a rubber...