Patents by Inventor Fritz Eiden

Fritz Eiden 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).

  • Hydrodipyrano-phthalazine compounds
    Patent number: 4002617
    Abstract: The present invention relates to novel hydrodipyranophthalazine compounds of the formula: ##STR1## wherein R.sub.1 = hydrogen or lower alkyl,R.sub.2 = hydrogen, chlorine or bromine,R.sub.3 = hydrogen or aralkyl if R.sub.2 = hydrogen,R.sub.3 = bromine or alkoxy if R.sub.2 = bromine,R.sub.3 = chlorine or alkoxy if R.sub.2 = chlorine, or ##STR2## wherein R.sub.4 = hydrogen, halogen, trifluoromethyl, alkyl, alkoxyl, alkylenedioxy, a possibly substituted amino group, or a nitro group,The 4,4'-bond is saturated or unsaturated, and acid-addition salts of these compounds.These compounds exert a valuable activity on the cardiovascular and central nervous system.
    Type: Grant
    Filed: November 5, 1975
    Date of Patent: January 11, 1977
    Assignee: Chem. Pharmaz. Fabrik Dr. Herman Thiemann G.m.b.H.
    Inventors: Fritz Eiden, Claus Schmiz
  • 11H,12H-[1]benzopyrano[2,3-b][1]benzopyran-11,12-dione and derivatives
    Patent number: 3978081
    Abstract: Benzopyrano-benzopyranes and the sulfur analogs thereof, benzothiopyranobenzothiopyranes, useful as medicinal agents. Compositions of matter including 11H,12H-[1]benzopyrano[2,3-b][1]benzopyran-11,12-dione or 11H,12H-[1]benzothiopyrano[2,3-b][1]benzothiopyran-11,12-dione, and derivatives thereof including acid addition salts.
    Type: Grant
    Filed: March 12, 1975
    Date of Patent: August 31, 1976
    Assignee: Chem. pharmaz. Fabrik Dr. Hermann Thiemann GmbH
    Inventors: Fritz Eiden, Hans-Dieter Schweiger