Patents by Inventor Christian Rietzel

Christian Rietzel 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).

  • Pteridine compounds
    Patent number: 4910203
    Abstract: Pteridine compounds, useful as diuretics, of the formula ##STR1## wherein R.sub.1 and R.sub.2 taken alone are, independently of each other, hydrogen, alkyl having from 1 to 6 carbon atoms, or benzyl, or wherein R.sub.1 and R.sub.2, taken together with the nitrogen atom to which they are bound, form a five- or six-membered heterocyclic ring system or such a ring containing one or two further hetero atoms, or wherein R.sub.1 and R.sub.
    Type: Grant
    Filed: April 20, 1988
    Date of Patent: March 20, 1990
    Inventors: Christian Rietzel, Heinrich Knauf, Ernst Mutschler, Karl-Dieter Voelger
  • Diuretic pharmaceutical compositions and method of use containing the sulfuric acid half-ester of 2,4,7-triamino-6p-hydroxyphenyl pteridine
    Patent number: 4118492
    Abstract: A pharmaceutical composition for inducing diuresis, which composition comprises a diuretically-effective amount of the sulfuric acid half ester of 2,4,7-triamino-6-p-hydroxyphenyl pteridine or of a physiologically tolerable salt thereof in combination with a pharmaceutical carrier.
    Type: Grant
    Filed: March 31, 1977
    Date of Patent: October 3, 1978
    Assignee: Rohm GmbH
    Inventors: Karl-Dieter Voelger, Christian Rietzel, Klaus Lehmann