Patents by Inventor David W. Heaton

David W. Heaton 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 preparing azetidinones
    Patent number: 4940788
    Abstract: A process for preparing azetidinones of the formula: ##STR1## wherein R.sup.1 is an amino-protecting group and R.sup.2 is alkyl or aryl, which comprises reacting compounds of the formulae (VIII) and (IX) ##STR2## wherein L is a leaving group. The product azetidinones are intermediates in the preparation of penem and carbapenem antibiotics.
    Type: Grant
    Filed: January 19, 1988
    Date of Patent: July 10, 1990
    Assignee: Imperial Chemical Industries PLC
    Inventors: Ian M. Cunningham, David W. Heaton