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Return to Abstracts of Patents Return to Abstracts of Patents 1250-1499 Patent Abstracts1289. ------. [I. G. FARBENINDUSTRIE A. G.] Hydrocarbons and Their Oxygenated Derivatives. British Patent 503,247, Apr. 4, 1939. Chem. Abs., vol. 33, 1939, p. 7310. See British Patent 468,434 (abs. 1264) and French Patent 48,876 (abs. 1279). |