Patents by Inventor Jan Kalter

Jan Kalter 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).

  • Cephalosporin deoxygenation process
    Patent number: 4695627
    Abstract: A process for the preparation of 7.beta.-acylamino-3-substituted-3-cephem-4-carboxylic acid compounds comprising reacting at -70.degree. C. to 0.degree. C. in an inert organic solvent phosphorus pentachloride with a cephalosporin compound in the presence of an olefinic compound having at least one carbon-carbon double bond having not more than three hydrogen atoms attached thereto capable of removing chlorine at least in part by addition to a carbon-carbon double bond.
    Type: Grant
    Filed: September 21, 1984
    Date of Patent: September 22, 1987
    Assignee: Gist-Brocades N.V.
    Inventors: Jan Verweij, Herman H. Grootveld, Henri G. J. Hirs, Gerardus J. Van Veen, Jan Kalter, Peter W. Henniger