Return to Abstracts of Patents Return to Abstracts of Patents 500-749 Patent Abstracts519. ------. [DREYFUS, H.] (British Celanese, Ltd.). [Catalyst for Methanol Synthesis.] French Patent 713,707, no date. Schmidt, J., Das Kohlenoxyd, Akad. Veriagsgesell., Leipzig, 1950, p. 205. Colloidal Zn (OH)2. |