Patents by Inventor Rolf Bunnenberg

Rolf Bunnenberg 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).

  • Continuous process for the preparation of diaminodicyclohexylmethane
    Patent number: 6504060
    Abstract: The invention relates to a process for the preparation of diaminodicyclohexylmethane (“PACM”) with a proportion of trans,trans-4,4′-diaminodicyclohexylmethane of from 17 to 24% by hydrogenation of diaminodiphenylmethane (“MDA”) in the presence of a pulverulent catalyst in a continuously operated suspension reactor at a conversion of MDA of at least 95%, based on the amount of MDA used.
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: January 7, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Bunnenberg, Andreas Gröschl, Michael Holzbrecher, Andreas Schulze Tilling
  • Continuous process for the preparation of diaminodicyclohexylmethane
    Publication number: 20020198409
    Abstract: The invention relates to a process for the preparation of diaminodicyclohexylmethane (“PACM”) with a proportion of trans,trans-4,4′-diaminodicyclohexylmethane of from 17 to 24% by hydrogenation of diaminodiphenylmethane (“MDA”) in the presence of a pulverulent catalyst in a continuously operated suspension reactor at a conversion of MDA of at least 95%, based on the amount of MDA used.
    Type: Application
    Filed: April 15, 2002
    Publication date: December 26, 2002
    Inventors: Rolf Bunnenberg, Andreas Groschl, Michael Holzbrecher, Andreas Schulze Tilling
  • 3,6-Disubstituted 2-thioxo-1,3,5-thiadiazin-4-ones
    Patent number: 4568672
    Abstract: 3,6-Disubstituted 2-thioxo-1,3,5-thiadiazin-4-ones of the formula ##STR1## in which R.sup.1 represents hydrogen; alkyl which is optionally monosubstituted or polysubstituted by identical or different substituents; alkenyl which is optionally monosubstituted or polysubstituted by identical or different substituents; alkinyl which is optionally monosubstituted or polysubstituted; cycloalkenyl or cycloalkyl which is optionally monosubstituted or polysubstituted by identical or different substituents; aryl or aralkyl which is optionally monosubstituted or polysubstituted by identical or different substituents; or a heterocyclic structure which is monosubstituted or polysubstituted by identical or different substituents;R.sup.
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: February 4, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wilhelm Brandes, Rolf Bunnenberg, Gerd Hanssler, Paul Reinecke, Karlfried Wedemeyer