. . . . . . . . . . . . . . . . . . . . . . . . "Michael Diamantoglou, Gerhard Meyer, \"Process for the production of water-insoluble fibers of cellulose monoesters of maleic acid, succinic acid and phthalic acid, having an extremely high absorbability for water and physiological liquids.\" U.S. Patent US4734239, issued April, 1941."@en . . . "Phthalic Acid"@en . . . . "experimental"@en . . . . . . . . . . . . "88-99-3"@en . .