Patents by Inventor Kurt Freter

Kurt Freter 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).

  • Antiallergic N-[4-(indolyl)-piperidino-alkyl]-benzimidazolones
    Patent number: 4359468
    Abstract: Compounds of the formula ##STR1## wherein R.sub.1 is hydrogen, halogen or methoxy;R.sub.2 is hydrogen or lower alkyl;R.sub.3 is hydrogen or lower alkyl;R.sub.4 is hydrogen, lower alkyl or alkenyl of 3 carbon atoms; andn is 2 to 6;and non-toxic, pharmacologically acceptable acid addition salts thereof. The compounds as well as their salts are useful as antiallergics and hypotensives.
    Type: Grant
    Filed: February 25, 1981
    Date of Patent: November 16, 1982
    Assignee: Boehringer Ingelheim Ltd.
    Inventors: Kurt Freter, Victor Fuchs, James T. Oliver
  • Pharmaceutical compositions containing a 2-carboxy-4-oxo-4H,-10H-(2)benzopyrano-(4,3-g)-(1) benzopyran or a salt thereof and method of use
    Patent number: 3998962
    Abstract: Pharmaceutical dosage unit compositions containing as an active ingredient a compound of the formula ##STR1## wherein R.sub.1 is hydrogen or lower alkyl, R.sub.2, R.sub.4 and R.sub.5, which may be identical to or different from each other, are each hydrogen, lower alkyl, hydroxyl, lower alkoxy, acyloxy, halogen, nitro or --SO.sub.3 H, andR.sub.3 and R.sub.6, which may be identical to or different from each other, are each hydrogen, lower alkyl, hydroxyl, lower alkoxy, acyloxy, halogen, nitro, --SO.sub.3 H, hydroxycarbonyl-methoxy, .beta.-hydroxy-ethoxy or .beta.-amino-ethoxy,Or a salt thereof; and a method of using the same as antiallergics.
    Type: Grant
    Filed: June 16, 1975
    Date of Patent: December 21, 1976
    Assignee: Boehringer Ingelheim GmbH
    Inventors: John Devlin, Patrick Brian Stewart, Kurt Freter
  • 2-Carboxy-4-oxo-4H,6H-(2)-benzopyrano-(3,4-f)-(1)-benzopyrans and esters and salts thereof
    Patent number: 3987186
    Abstract: Compounds of the formula ##SPC1##Wherein theR.sub.1 ' s are hydrogen, alkyl of 1 to 3 carbon atoms or together a double-bonded oxygen,R.sub.2 is hydrogen, fluorine, chlorine, methyl, hydroxyl, methoxy, hydroxy-ethoxy, nitro or --SO.sub.3 H,R.sub.3 is hydrogen, fluorine, chlorine or methoxy,R.sub.4 is hydrogen, methyl or methoxy,R.sub.5 is hydrogen, fluorine, chlorine or methyl, andR.sub.6 is hydrogen or alkyl of 1 to 8 carbon atoms, and, when R.sub.6 is hydrogen, salts thereof formed with an inorganic or organic base; the compounds as well as the salts are useful as antiallergics.
    Type: Grant
    Filed: February 7, 1975
    Date of Patent: October 19, 1976
    Assignee: Boehringer Ingelheim GmbH
    Inventors: John P. Devlin, Patrick Brian Stewart, Kurt Freter
  • (Indolyl-piperidino or -1,2,5,6-tetrahydro-pyridyl)-p-fluoro-butyrophenones and salts thereof
    Patent number: 3980658
    Abstract: Compounds of the formula ##SPC1##WhereinR.sub.1 is hydrogen, chlorine, methyl, methoxy or trifluoromethyl,R.sub.2 is hydrogen or methyl,R.sub.3 is methyl or phenyl, andR.sub.4 and R.sub.5 together form a double bond or, in caseR.sub.1 is chloro, methyl or trifluoromethyl, are also hydrogen atoms,And non-toxic, pharmacologically acceptable acid addition salts thereof; the compounds as well as their salts are useful as sedatives and tranquilizers.
    Type: Grant
    Filed: May 6, 1974
    Date of Patent: September 14, 1976
    Assignee: Boehringer Ingelheim GmbH
    Inventors: Genus Possanza, Kurt Freter, Sven Luttke