Patents by Inventor Helmut Schaum

Helmut Schaum 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).

  • Process for the preparation of practically formic acid-free acetic acid
    Patent number: 4380663
    Abstract: A process is provided for the preparation of practically formic acid-free acetic acid by oxidation of acetaldehyde in the liquid phase with oxygen or oxygen-containing gases in the presence of mixtures of cobalt, nickel and manganese salts as catalysts.
    Type: Grant
    Filed: October 20, 1977
    Date of Patent: April 19, 1983
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gunter Roscher, Helmut Schaum, Heinz Schmitz
  • Process for the purification of carboxylic acids
    Patent number: 4110372
    Abstract: A process for the removal of formic acid from a crude mixture thereof with carboxylic acids by reacting the formic acid component of the mixture with a carboxylic anhydride and/or a compound forming an anhydride with a carboxylic acid, which comprises carrying out the reaction in the presence of an acidic catalyst.
    Type: Grant
    Filed: August 12, 1975
    Date of Patent: August 29, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hansjorg Hey, Helmut Schaum, Hans-Jurgen Arpe
  • Process for preparing acetic acid
    Patent number: 4094901
    Abstract: Process for preparing acetic acid by oxidation of acetaldehyde with oxygen or oxygen containing gases in the presence of a catalyst based on manganese acetate, wherein the crude acetic acid and the gases formed, still containing acetaldehyde, are submitted to an after-oxidation, the low-boiling substances are distilled off and the residue is reused as catalyst.
    Type: Grant
    Filed: March 29, 1976
    Date of Patent: June 13, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Helmut Schaum, Friedrich Schenk, Hartmut Voigt, Rudolf Sartorius