1909 – The A.J. Reach Company is granted a patent for its cork-centered baseball, which will replace the hard rubber-cored one. This change will be particularly apparent in the National League in 1910 and 1911.

This Day In Baseball

On August 31, 1909 — 1909 – The A.J. Reach Company is granted a patent for its cork-centered baseball, which will replace the hard rubber-cored one. This change will be particularly apparent in the National League in 1910 and 1911.

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Sources:
Baseball Reference August 31
National Pastime August 31
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game