|
|
Return to Abstracts of Patents Return to Abstracts of Patents 500-749 Patent Abstracts527. ------. [DREYFUS, H.] [Formaldehyde and Methanol.] French Patent 22,293, May 25, 1921: appl. Filed Mar. 22, 1917. Chem. Zentralb., 1921, IV, p. 708. See British Patent 157,047 (abs. 528). |