Patents by Inventor Erich Renauer

Erich Renauer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Production of cationic condensation products
    Patent number: 4000184
    Abstract: Condensation products are prepared from carboxamides, formaldehyde, dicyandiamide and ammonium and/or amine salts in a single process step. After the end of the exothermic reaction the reaction mixture is heated for from 30 minutes to 5 hours at a temperature of from 70.degree. to 100.degree. C.
    Type: Grant
    Filed: January 8, 1975
    Date of Patent: December 28, 1976
    Assignee: BASF Aktiengesellschaft
    Inventors: Alfred Kerbeck, Eberhard Luecke, Erich Renauer, Guenter Reuss
  • Recovering maleic anhydride from the effluent from the production of phthalic anhydride
    Patent number: 3965126
    Abstract: Maleic anhydride is recovered by evaporating the effluent from the production of phthalic anhydride at from 40.degree. to 150.degree.C and from 50 to 760 mm to a water content of less than 10% by weight, heating the concentrate in a thin-film or falling-film evaporator at from 100 to 600 mm at from 120.degree. to 180.degree.C and distilling it in a column. The pure maleic anhydride is withdrawn laterally and the aqueous condensate is recycled to the offgas scrubber.
    Type: Grant
    Filed: October 25, 1974
    Date of Patent: June 22, 1976
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Wirth, Erich Renauer, Hans Von Ammon, Curt Schneider, Hubert Suter