Patents Assigned to Pzifer Inc.
  • Cephaloporins and homologues, preparations and pharmaceutical compositions
    Patent number: 6020329
    Abstract: .beta.-Lactam antibiotics of formula (I) or a salt thereof, wherein R.sup.1 is hydrogen, methoxy or formamido; R.sup.2 is an acy group; CO.sub.2 R.sup.3 is a carboxy group or a carboxylate anion, or R.sup.3 is a readily removable carboxy protecting group; R.sup.4 represents up to four substituents; X is S, SO, SO.sub.2, O or CH.sub.
    Type: Grant
    Filed: October 20, 1997
    Date of Patent: February 1, 2000
    Assignee: Pzifer Inc.
    Inventors: John Hargreaves Bateson, George Burton, Stephen Christopher Martin Fell