 That company then entered into a 50/50 agreement with Herman Frasch and his partners to form the Union Sulphur Company

In 1892, Cooper and his wife were included in Ward McAllister's "Four Hundred", purported to be an index of New York's best families, published in "The New York Times".Conveniently, 400 was the number of people that could fit into Mrs. Astor's ballroom.In 1854, Cooper was married to Cornelia Redmond (1829–1894), the daughter of James Morton Redmond and Anne (née Bowne) Redmond.