Patents by Inventor Richard Kirchlechner

Richard Kirchlechner 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).

  • Process for the preparation of 5-membered nitrogen containing heteroaromatics
    Patent number: 5075452
    Abstract: Compounds of the formula I ##STR1## in which A and X.sup.1 have the meaning given in patent claim 1 can be prepared in a simple manner, in a one-pot process and in high yields.
    Type: Grant
    Filed: December 6, 1989
    Date of Patent: December 24, 1991
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Richard Kirchlechner, Michael Casutt, Arno Basedow
  • Flavonoid phosphate salts of aminoglycoside antibiotics
    Patent number: 4617293
    Abstract: Flavonoid phosphates of aminoglycoside antibiotics are useful sparingly soluble salts, e.g., for achieving a depot effect.
    Type: Grant
    Filed: May 23, 1984
    Date of Patent: October 14, 1986
    Assignee: Merck Patent Gesellschaft mit beschraenkter Haftung
    Inventors: Helmut Wahlig, Elvira Dingeldein, Richard Kirchlechner, Dieter Orth, Werner Rogalski
  • Process for the preparation of sterically uniform, natural 6-thiatetracycline derivatives
    Patent number: 4229582
    Abstract: A process for the preparation of racemic 6-thiatetracycline derivatives comprises treating a mixture of epimers of corresponding 1,4,4a,5,5a,6,11,12a-octahydro-3,12-dihydroxy-1,11-dioxo-6-thianaphthacene -2-carboxamides with a saturated heterocyclic secondary amine having a total of 4 to 12 carbon atoms for a sufficient length of time at temperatures of about 15.degree.-120.degree. C.
    Type: Grant
    Filed: October 13, 1978
    Date of Patent: October 21, 1980
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventor: Richard Kirchlechner
  • Tetracyclic compounds
    Patent number: 4024272
    Abstract: Tetracyclic compounds of the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each are H or alkyl, R.sup.5 is H, F, Cl, Br, CF.sub.3, OH, alkyl, alkoxy, NO.sub.2, NH.sub.2, alkylamino, dialkylamino or acylamino and X is O, S, SO, SO.sub.2, NH, N-alkyl or N-acyl, alkyl and alkoxy in each case being of 1-3 carbon atoms and acyl in each case being of 1-4 carbon atoms, with the proviso that when R.sup.5 is methoxy and X is a sulfur atom, R.sup.5 is in the 8- or 9-position only, and their physiologically acceptable acid addition salts, possess broad spectrum antibacterial activity, including tetracycline-resistant Gram-positive and Gram-negative organisms.
    Type: Grant
    Filed: August 26, 1975
    Date of Patent: May 17, 1977
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Werner Rogalski, Richard Kirchlechner, Jurgen Seubert, Rudolf Gottschlich, Rosmarie Steinigeweg, Rolf Bergmann, Helmut Wahlig, Joachim Gante
  • 7-Methoxy-6-thiatetracyclines and their preparation
    Patent number: 3988468
    Abstract: 7-Methoxy-6-thiatetracyclines of the formula ##SPC1##Wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each are H or alkyl of 1 to 4 carbon atoms, and the physiologically acceptable acid addition salts thereof.
    Type: Grant
    Filed: July 30, 1975
    Date of Patent: October 26, 1976
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Werner Rogalski, Richard Kirchlechner, Juergen Seubert, Rudolf Gottschlich, Walter Hameister, Rolf Bergmann, Helmut Wahlig