FR784706A (en )1935-07-23 Apparatus for biological water purification FR791182A (en )1935-12-05 Process for water improvement FR810636A (en )1937-03-24 Process for water purification FR798371A (en )1936-05-15 Process for preparing hydrocyanic acid FR799068A (en )1936-06-05 Water purification process FR794621A (en )1936-02-21 Process for the purification of alcohols FR48963E (en )1938-10-05 Process for preparing methacrylic amide FR804999A (en )1936-11-06 Process for preparing 1, 4-dioxy-alkylamino-anthraquinones FR800003A (en )1936-06-25 Refining process for steels FR784190A (en )1935-07-22 Process for obtaining tanned images FR811829A (en )1937-04-23 Process for water softening FR785134A (en )1935-08-02 Wastewater purification process FR803387A (en )1936-09-29 Water purification process FR803227A (en )1936-09-25 Process for preparing amides containing the azaderivative radical FR782896A (en )1935-06-14 Hydrocarbon purification process FR793481A (en )1936-01-25 Sewage treatment process FR757080A (en )1933-12-20 Raw salt purification process FR780115A (en )1935-04-19 Process for water purification FR785852A (en )1935-08-21 Process for the purification of hydrocarbons FR783376A (en )1935-07-11 Process for improving the roughness of pavements FR783217A (en )1935-07-10 Process for producing waterproof coatings FR799632A (en )1936-06-16 Alkaline detergents purification process FR789933A (en )1935-11-08 Process for preparing oleum FR793624A (en )1936-01-28 Process for refining impure lead FR788383A (en )1935-10-09 Process for the improvement of inks