[168] Simon, M., Jr.: Ger. Pat., 253,419, Feb. 19, 1911.
[169] Von Niessen: British Pat., 7,427, Mar. 24, 1910.
[170] Eng. Pat., 5,776, Mar. 19, 1895.
[171] U.S. Pat., 832,322.
[172] Eng. Pat., 8,270, April 24, 1893.
[173] U.S. Pat., 994,785, June 13, 1911.
[174] Am. J. Pharm., 1915 (vol. lxxxvii: pp. 524–26).
[175] Orig. Com. 8th Intern. Cong. Appl. Chem. (Appen.) (vol. xxvi: p. 389)
[176] Tea & Coffee Trade Jour., 1920 (vol. xxxix: pp. 318–19).
[177] King, J.E.: U.S. Pat. 1,263,434.