DREYFUS BROTHERS , pioneers of the cellulose acetate rayon industry. The brothers, henry (1876–1945) and camille (1878–1956), were born in Basle, Switzerland. They developed quality cellulose fiber soluble in acetone and manufactured noninflammable cellulose film, used by the Allies in World War i for treating fabric wings of airplanes. After the war they developed in England processes for spinning this film into man-made fiber, Celanese. Henry headed British Celanese Ltd.; Camille became president of Celanese Corporation of America and Canadian Celanese Ltd. Henry took out over 1,000 patents, the greatest number ever held by a single individual.