Patents by Inventor Stefan Jendrzejewski

Stefan Jendrzejewski 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).

  • Patent number: 5077432
    Abstract: Compounds having the formula ##STR1## and pharmaceutically acceptable salts thereof, wherein R.sub.3 and R.sub.4 are the same or different and each is hydrogen or alkyl or R.sub.3 and R.sub.4 taken together with the nitrogen atoms to which they are attached form a 1,2-diazacyclobutane, 1,2-diazacyclopentane, 1,2-diazacyclohexane, or 1,2-diazacycloheptane ring and Y, and Y.sub.2 are either hydrogen or hydroxy but are not the same; are useful chemical intermediates for the preparation of .beta.-lactam antibiotics.
    Type: Grant
    Filed: February 7, 1991
    Date of Patent: December 31, 1991
    Assignee: E. R. Squibb & Sons, Inc.
    Inventors: Joseph E. Sundeen, Robert Zahler, Stefan Jendrzejewski
  • Patent number: 5030724
    Abstract: Antibacterial activity is exhibited by novel compounds having the formula ##STR1## or a pharmaceutically acceptable salt thereof. R.sub.3 and R.sub.4 are the same or different and each is hydrogen or alkyl or R.sub.3 and R.sub.4 taken together with the nitrogen atoms to which they are attached form a 1,2-diazacyclobutane, 1,2-diazacyclopentane, 1,2-diazacyclohexane, or 1,2-diazacycloheptane ring.Y.sub.1 and Y.sub.2 are either hydrogen or OR.sub.11 but are not the same.R.sub.11 is hydrogen, alkanoyl of from one to ten carbon atoms, substituted alkanoyl of from two to ten carbon atoms, phenylcarbonyl, (substituted phenyl) carbonyl, heteroarylcarbonyl, phenylalkanoyl, (substituted phenyl) alkanoyl, or heteroarylalkanoyl.
    Type: Grant
    Filed: January 22, 1990
    Date of Patent: July 9, 1991
    Assignee: E. R. Squibb & Sons, Inc.
    Inventors: Joseph E. Sundeen, Robert Zahler, Stefan Jendrzejewski