Patents by Inventor Dieter Steinhoff

Dieter Steinhoff 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).

  • Urethane derivatives of 2-phenyl-4(3H)-quinazolones
    Patent number: 3932409
    Abstract: 2-Phenyl-4(3H)-quinazolones bearing a urethane or thiourethane group on the 2-phenyl substituent, a second urethane or thiourethane group on the benzo ring of the quinazolone nucleus and an alkyl, cycloalkyl or phenyl group in the 3-position are prepared by treating the corresponding bis-amino compound with an acid derivative or the corresponding bis(isocyanate) or bis(isothiocyanate) with an alcohol. The compounds, of which 2-[3'-(methoxycarbonylamino)-phenyl]-3-phenyl-6-methoxycarbonylamino-4-(3H )-quinazolone is a typical embodiment, are cytostatic agents.
    Type: Grant
    Filed: June 7, 1974
    Date of Patent: January 13, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Egon Kunzel, Gerhard Dieter Wolf, Robert Bierling, Siegfried Petersen, Gunther Nischk, Dieter Steinhoff