Patents by Inventor Georg Ujvari

Georg Ujvari 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).

  • Xanthene and thioxanthene derivatives, compositions thereof and a method of preparation thereof
    Patent number: 4035503
    Abstract: The present invention relates to novel xanthene and thioxanthene derivatives of the following general formula: ##STR1## wherein Y represents sulfur or oxygen, R.sup.1 represents hydrogen, chlorine, trifluoromethyl or dimethylsulfamoyl, R.sup.2 represents hydrogen or fluorine; and R.sup.3 and R.sup.4 each represents hydrogen or methyl, provided that R.sup.3 and R.sup.4 may not both represent hydrogen, or R.sup.3 and R.sup.4 taken together with the nitrogen atom form a piperazine or piperidine ring optionally substituted in the 4-position by a methyl group or a 2-hydroxyethyl group, if desired, esterified with an aliphatic carboxylic acid having from one to seventeen carbon atoms inclusive, as well as non-toxic acid addition salts thereof.
    Type: Grant
    Filed: March 1, 1976
    Date of Patent: July 12, 1977
    Assignee: Kefalas A/S
    Inventors: Georg Ujvari, Peter Bregnedal Hansen
  • Xanthene and thioxanthene compositions and method of treating
    Patent number: 4022896
    Abstract: The present invention relates to novel xanthene and thioxanthene derivatives of the following general formula: ##STR1## wherein Y represents sulfur or oxygen, R.sup.1 represents hydrogen, chlorine, trifluoromethyl or dimethylsulfamoyl,R.sup.2 represents hydrogen or fluorine; and R.sup.3 and R.sup.4 each represents hydrogen or methyl, provided that R.sup.3 and R.sup.4 may not both represent hydrogen, or R.sup.3 and R.sup.4 taken together with the nitrogen atom form a piperazine or piperidine ring optionally substituted in the 4-position by a methyl group or a 2-hydroxyethyl group, if desired, esterified with an aliphatic carboxylic acid having from one to seventeen carbon atoms inclusive, as well as non-toxic acid addition salts thereof.
    Type: Grant
    Filed: March 1, 1976
    Date of Patent: May 10, 1977
    Assignee: Kefalas A/S
    Inventors: Georg Ujvari, Peter Bregnedal Hansen
  • Xanthene and thioxanthene derivatives, compositions thereof and a method of preparation thereof
    Patent number: 3951961
    Abstract: The present invention relates to novel xanthene and thioxanthene derivatives of the following general formula: ##SPC1##Wherein Y represents sulfur or oxygen, R.sup.1 represents hydrogen, chlorine, trifluoromethyl or dimethylsulfamoyl, R.sup.2 represents hydrogen or fluorine; and R.sup.3 and R.sup.4 each represents hydrogen or methyl, provided that R.sup.3 and R.sup.4 may not both represent hydrogen, or R.sup.3 and R.sup.4 taken together with the nitrogen atom form a piperazine or piperidine ring optionally substituted in the 4-position by a methyl group or a 2-hydroxyethyl group, if desired, esterified with an aliphatic carboxylic acid having from 1 to 17 carbon atoms inclusive, as well as non-toxic acid addition salts thereof.
    Type: Grant
    Filed: November 21, 1974
    Date of Patent: April 20, 1976
    Assignee: Kefalas A/S
    Inventors: Georg Ujvari, Peter Bregnedal Hansen