Patents by Inventor Stefan Hildbrand

Stefan Hildbrand 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 preparing cyanoacetic esters
    Patent number: 6239307
    Abstract: Cyanoacetic esters of the general formula: in which R is C1-10-alkyl, C3-10-alkenyl or aryl-C1-4alkyl, are prepared by the reaction of alkali metal cyanoacetates with the corresponding halides R—X, in which X is chlorine, bromine or iodine, in an aqueous/organic two-phase system in the presence of a phase-transfer catalyst.
    Type: Grant
    Filed: February 9, 2000
    Date of Patent: May 29, 2001
    Assignee: Lonza AG
    Inventors: Stefan Hildbrand, Paul Hanselmann