Patents by Inventor David Michael Pfisterer

David Michael Pfisterer 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 a ketimine
    Patent number: 6232500
    Abstract: This invention relates to a novel improved process for preparation of N-[4-(3,4-dichlorophenyl)-3,4-dihydro-1(2H)-naphthalenylidene]methanamine from 4-(3,4-dichloro-phenyl)-3,4-dihydro-1(2H)-naphthalenone and monomethylamine.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: May 15, 2001
    Assignee: Pfizer Inc
    Inventors: Juan Carlos Colberg, David Michael Pfisterer, Geraldine Patricia Taber