Patents Examined by Nancy Chan
  • Polycyclic ether antibiotic
    Patent number: 4912130
    Abstract: A new acidic polycyclic antibiotic UK-61,689 has the formula: ##STR1## or a pharmaceutically acceptable cationic salt thereof. The antiobiotic and its cationic salts are active against a variety of microorganisms and are effective in controlling coccidiosis, enteritis and swine dysentery as well as being effective in promotion of growth and/or improving efficiency of feed utilization in swine and ruminants.
    Type: Grant
    Filed: December 6, 1988
    Date of Patent: March 27, 1990
    Assignee: Pfizer Inc.
    Inventors: Alexander C. Goudie, Nigel D. A. Walshe