Clarkson-Stanfield Concentrator Co
1890 Richard Stanfield, Professor of Engineering of Edinburgh, and Thomas Clarkson, a demonstrator of metallurgy of London, gained a Canadian patent on "Method and apparatus for sizing and separating ores, etc". Also with Peter Strickland they gained a Spanish patent in a similar area of technology.
1891 Thomas Clarkson became Engineer to the company.
1897 The Company's Patents were sold to the Clarkson-Stanfield Ore Reduction Co, Limited, and the company was wound up voluntarily[1]
1899 The Clarkson-Stanfield Ore Reduction Co Ltd was wound up[2]