Patents by Inventor Ian R. Chester

Ian R. Chester 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 the preparation of penicillins and penicillin derivatives
    Patent number: 4413056
    Abstract: A process for the preparation of a compound of formula (I): ##STR1## wherein R.sup.1 is hydrogen, hydroxy, mercapto radical, a substituted or unsubstituted methoxy, ethoxy, methyl, ethyl, methyl thio, or ethylthio radical, a carbamoyloxy, carbamoylthio, C.sub.1-6 alkanoyloxy, C.sub.1-6 alkanoylthio, cyano, carboxy or carbamoyl radical; andR.sup.2 represents an acyl group which comprises hydrolysis of a compound of formula (II): ##STR2## wherein R.sup.1 and R.sup.2 are as defined with respect to formula (I) hereinbefore and R.sup.3 represents benzyl or substituted benzyl; wherein the hydrolysis is catalyzed by a microbial serine proteinase.
    Type: Grant
    Filed: October 19, 1981
    Date of Patent: November 1, 1983
    Assignee: Beecham Group Limited
    Inventors: Ian R. Chester, Lawson W. Powell, David G. Roberts