Return to Abstracts of Patents

Return to Abstracts of Patents 500-749

Patent Abstracts

      557.  ------.  [DREYFUS, H.]  [Production of Formaldehyde and Methanol From Carbon Monoxide or Carbon Dioxide by Catalytic Hydrogenation.]  French Patent 492,154, Aug. 12, 1916.

            See British Patent 157,047 (abs. 528) and French Patent 22,293, (abs. 527).