Patents by Inventor Hugo H. J. M. Liefooche

Hugo H. J. M. Liefooche 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 removal of impurities from phenol by means of at least one acid catalyst
    Patent number: 6489519
    Abstract: Impurities are removed from phenol by a process, comprising: first treating phenols containing impurities with at least one acid catalyst which converts the impurities into compounds which can be separated from phenol; separating the acid treated phenol from the compounds; and treating the distilled phenol a second time with at least one acid catalyst; thereby effectively removing the impurities from phenol.
    Type: Grant
    Filed: October 26, 2000
    Date of Patent: December 3, 2002
    Assignee: Phenolchemie GmbH & Co. KG
    Inventors: Heinrich van Barneveld, Otto Gerlich, Wilfried Jordan, Otto Schnurr, Hugo H. J. M. Liefooche