Patents by Inventor Holger Sauerstein

Holger Sauerstein 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).

  • Method for producing 2-(4-methyl-3-pentenyl) anthraquinone
    Patent number: 6399795
    Abstract: A method for producing 2-(4-methyl-3-pentenyl)anthraquinone (IHEAQ) that includes a Diels-Alder addition of naphtho-1,4-quinone and myrcene and an oxidation of the resulting adduct. The oxidation step is carried out in the presence of a solvent mixture that contains a polar and a nonpolar solvent. The oxidation takes place with air or an O2-containing gas in the presence of a combination of a strong inorganic base and an organic, especially a nitrogen-containing base. The method leads to a higher space-time yield and higher product purity.
    Type: Grant
    Filed: July 24, 2001
    Date of Patent: June 4, 2002
    Assignee: Degussa AG
    Inventors: Jürgen Glenneberg, Holger Sauerstein, Hubert Angert
  • Method for producing 2-(4-methyl-3-pentenyl)anthraquinone
    Publication number: 20020035280
    Abstract: A method for producing 2-(4-methyl-3-pentenyl)anthraquinone (IHEAQ) that includes a Diels-Alder addition of naphtho-1,4-quinone and myrcene and an oxidation of the resulting adduct. The oxidation step is carried out in the presence of a solvent mixture that contains a polar and a nonpolar solvent. The oxidation takes place with air or an O2-containing gas in the presence of a combination of a strong inorganic base and an organic, especially a nitrogen-containing base. The method leads to a higher space-time yield and higher product purity.
    Type: Application
    Filed: July 24, 2001
    Publication date: March 21, 2002
    Inventors: Jurgen Glenneberg, Holger Sauerstein, Hubert Angert
  • Method for the preparation of substituted trihydroxybenzenes
    Patent number: 4762953
    Abstract: A method for the production of substituted 1,2,3- and 1,2,4-trihydroxybenzenes in a single process reaction step, wherein the corresponding substituted resorcinol which is a substituted 1,3-dihydroxybenzene is contacted with an aqueous hydrogen peroxide solution and through control of the water content of the initial reaction condition and control of the reaction temperature the desired products are obtained.
    Type: Grant
    Filed: February 26, 1987
    Date of Patent: August 9, 1988
    Assignee: Degussa Aktiengesellschaft
    Inventors: Guenter Prescher, Gebhard Ritter, Holger Sauerstein
  • Process for the production of trihydroxy-and/or alkoxy-hydroxybenzenes
    Patent number: 4751332
    Abstract: Resorcinol and substituted resorcinols are converted in one single step reaction into 1,2,3- and 1,2,4-trihydroxybenzenes and substituted hydroxy resorcinol compounds with a benzene solution of peroxypropionic acid.
    Type: Grant
    Filed: September 14, 1987
    Date of Patent: June 14, 1988
    Assignee: Degussa Aktiengesellschaft
    Inventors: Guenter Prescher, Gebhard Ritter, Holger Sauerstein
  • Method for the preparation of trihydroxybenzenes
    Patent number: 4751333
    Abstract: Method for the conversion of resorcinol with aqueous hydrogen peroxide to obtain a mixture of 1,2,3- and 1,2,4-trihydroxybenzenes wherein the amount of water present in the initial reaction mixture is controlled to small amounts.
    Type: Grant
    Filed: February 26, 1987
    Date of Patent: June 14, 1988
    Assignee: Degussa Aktiengesellschaft
    Inventors: Guenter Prescher, Gebhard Ritter, Holger Sauerstein