Patents by Inventor Keith A. Menear

Keith A. Menear 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).

  • Substituted azacyclohexyl derivatives
    Patent number: 5147870
    Abstract: The invention relates to the preparation of substituted azacyclohexyl derivatives of rifamycins of the formula ##STR1## and salts thereof in which R.sub.1 is hydrogen or trialkylacetyl, R.sub.2 is hydrogen or acetyl and R.sub.3 is alkyl, which exhibit valuable pharmacological properties.
    Type: Grant
    Filed: October 18, 1991
    Date of Patent: September 15, 1992
    Assignee: Ciba-Geigy Corporation
    Inventors: Wilhelm Kump, Keith A. Menear
  • Open chain rifamycin derivatives
    Patent number: 5100894
    Abstract: Compounds of the general formula: ##STR1## in which R is a lower alkyl group, and R.sub.1 is a tri-lower alkylmethylcarbonyl group, the structure elements --A.sub.1 --A.sub.2 --, A.sub.3 --A.sub.4 -- or A.sub.5 --A.sub.6 -- each represent ethylene or vinylene, or the elements --A.sub.1 --A.sub.2 -- and --A.sub.3 --A.sub.4 -- each represent ethylene and --A.sub.5 --A.sub.6 -- represents vinylene, their optical isomers and their salts exhibit valuable pharmaceutical properties.
    Type: Grant
    Filed: April 12, 1991
    Date of Patent: March 31, 1992
    Assignee: Ciba-Geigy Corporation
    Inventors: Peter W. Taylor, Ian T. W. Matthews, Jane I. Lowrie, Keith A. Menear, Wilhelm Kump