Patents by Inventor Hardo Siegel

Hardo Siegel 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).

  • Preparation of 2,5-dimethylfuran-3-carboxylic amides
    Patent number: 4013684
    Abstract: New and valuable process for the production of 2,5-dimethylfuran-3-carboxylic amides by reaction of acyloxypropionaldehyde with acetoacetamide.
    Type: Grant
    Filed: May 14, 1973
    Date of Patent: March 22, 1977
    Assignee: Badische Anilin- & Soda-Fabrik Aktiengesellschaft
    Inventors: Hans Rupert Merkle, Hardo Siegel
  • Resolution of racemic pantolactone
    Patent number: 3996246
    Abstract: A process for resolving racemic .alpha.-hydroxy-.beta.,.beta.-dimethyl-.gamma.-butyrolactone, referred to as D,L-pantolactone, into its optical antipodes, based on the separation of diastereomeric salts of D,L-pantoic acid (.alpha.,.gamma.-dihydroxy-.beta.,.beta.-dimethylbutyric acid), produced from D,L-pantolactone, by means of (-)-3-aminomethylpinane, (+)-3-aminomethylpinane or one of their acid addition salts, as a new resolving agent.
    Type: Grant
    Filed: January 24, 1975
    Date of Patent: December 7, 1976
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Hoffmann, Walter Himmele, Joachim Paust, Karl Von Fraunberg, Hardo Siegel, Sigberg Pfohl
  • Production of 3-methylpentane-1,5-diol
    Patent number: 3966827
    Abstract: The production of 3-methylpentane-1,5-diol by hydroformylation of 2-methylbut-1-en-4-ol with carbon monoxide and hydrogen at elevated temperature and superatmospheric pressure in the presence of a rhodium carbonyl complex which has been modified by a tertiary organic phosphine followed by hydrogenation of the 2-hydroxy-4-methyltetrahydropyran at elevated temperature and superatmospheric pressure in the presence of a hydrogenation catalyst.
    Type: Grant
    Filed: January 16, 1975
    Date of Patent: June 29, 1976
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Aquila, Walter Himmele, Werner Fliege, Hardo Siegel