Patents by Inventor Wolfgang Bruggemann

Wolfgang Bruggemann 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).

  • Selective production of o-alkylphenols
    Patent number: 6846962
    Abstract: In a method for the production of o-alkyl phenols by conversion of phenol with an alkanol at elevated temperature in the gas phase in the presence of a metal catalyst, the conversion takes place in at least two stages wherein the alkanol/phenol molar ratio in each reaction stage is set to a value of approximately ?0.4; a clear increase in the selectivity for the o-alkyl phenol is obtained.
    Type: Grant
    Filed: November 15, 2002
    Date of Patent: January 25, 2005
    Assignee: Rutgers Chemicals AG
    Inventors: Jörg Talbiersky, Edgar Fuhrmann, Wolfgang Brüggemann
  • Selective production of o-alkylphenols
    Publication number: 20040158104
    Abstract: In a method for the production of o-alkyl phenols by conversion of phenol with an alkanol at elevated temperature in the gas phase in the presence of a metal catalyst, the conversion takes place in at least two stages wherein the alkanol/phenol molar ratio in each reaction stage is set to a value of approximately ≦0.4; a clear increase in the selectivity for the o-alkyl phenol is obtained.
    Type: Application
    Filed: December 11, 2003
    Publication date: August 12, 2004
    Inventors: Jorg Talbiersky, Edgar Fuhrmann, Wolfgang Bruggemann
  • Method for removing metal ions from cresol mixtures
    Patent number: 6258985
    Abstract: A method for removing of metal ions from cresol or from mixtures of aromatic compounds containing cresol is disclosed, wherein the water content in the cresol mixture is adjusted to at least about 0.5 per cent by weight by the addition of water and the water-and-cresol mixture is subsequently passed over an acid ion exchanger. As a result of this process a metal ion content of less than 20 ppb per metal ion is achieved.
    Type: Grant
    Filed: November 23, 1999
    Date of Patent: July 10, 2001
    Assignee: Rütgers VFT AG
    Inventors: Jörg Talbiersky, Edgar Fuhrmann, Wolfgang Brüggemann