They settled on a mixture of Illinois-sourced silica with small amounts of corundum or aloxite (aluminum oxide, AL2O3), founding the William A. Spinks Company in Chicago after securing a patent on March 9, 1897.
The group picked an inclusion of Illinois-sourced silica and minimal amounts of corundum or aloxite (aluminum oxide, AL2O3) to establish the William A. Spinks Company in Chicago, receiving a patent on March 9, 1897.