Patents by Inventor Raf Reintjens

Raf Reintjens 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).

  • Enzymatic process for the preparation of (S)-cyanohydrins
    Patent number: 6225095
    Abstract: Process for the preparation of the (S)-enantiomers of optically active cyanohydrins, in which a reaction mixture of a) an aldehyde or ketone dissolved in an organic, water-immiscible or slightly miscible diluent, b) an aqueous (S)-hydroxynitrile lyase solution and c) a cyanide group donor is stirred in such a way that an emulsion is formed which is maintained up to the end of the reaction by stirring.
    Type: Grant
    Filed: December 29, 1998
    Date of Patent: May 1, 2001
    Assignee: DSM Fine Chemicals Austria GmbH
    Inventors: Peter Pöchlauer, Michael Schmidt, Irma Wirth, Rudolf Neuhofer, Antonia Zabelinskaja-Mackova, Herfried Griengl, Cor Van den Broek, Raf Reintjens, Herman Jelle Wories
  • Process for the preparation of 1-amino-1-methyl-3(4)-aminomethyl cyclohexane
    Patent number: 5900507
    Abstract: The present invention relates to a process for the preparation of 1-amino-1-methyl-3(4)-aminomethyl cyclohexane (AMCA) bya) catalytically hydrogenating 1-formamido-1-methyl-3(4)-cyano cyclohexane (FMC) in a first reaction stage to form 1-formamido-1-methyl-3(4)-aminomethyl cyclohexane (FMA), 1-amino-1-methyl-3(4)-formamidomethyl cyclohexane (AMF), 1-formamido-1-methyl-3(4)-formamidomethyl cyclohexane (FMF) and/or AMCA, andb) reacting FMA, AMF and/or FMF in a second reaction stage with an alkaline compound to from AMCA and a formic acid derivative, andc) separating the reaction mixture obtained in step b) into components by fractional distillation and/or by crystallization and filtration.The present invention is also relates to carrying the hydrogenation reaction of step a) in the presence of a formulating agent to form 1-formamido-1-methyl-3(4)-formamidomethyl cyclohexane (FMF).
    Type: Grant
    Filed: March 11, 1998
    Date of Patent: May 4, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Konrad Fischer, Oswald Wilmes, Dieter Arlt, Carl Casser, Peter Maas, Pierre Woestenborghs, Theo Van Der Knaap, Raf Reintjens