Patents by Inventor Frederick H. Van Der Steen

Frederick H. Van Der Steen 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).

  • Meta-containing enolate compounds
    Patent number: 4898955
    Abstract: Trans-.beta.-lactams are prepared in a nearly quantitative yield by a condensation reaction of a new intermediate metal enolate and an appropriate imine. Certain new metal enolates are provided as intermediates.
    Type: Grant
    Filed: December 12, 1988
    Date of Patent: February 6, 1990
    Assignee: Gist-Brocades N.V.
    Inventors: Gerard Van Koten, Frederick H. Van Der Steen, Johann T. B. H. Jastrzebski