Patents by Inventor John J. Freskos

John J. Freskos 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).

  • Method of preparing intermediates for retroviral protease inhibitors
    Patent number: 5872298
    Abstract: A synthesis is described for intermediates which are readily amenable to the large scale preparation of hydroxyethylurea-based chiral HIV protease inhibitors. The method includes forming a diastereoselective epoxide or cyanohydrin from a chiral alpha amino aldehyde.
    Type: Grant
    Filed: April 9, 1997
    Date of Patent: February 16, 1999
    Assignee: G. D. Searle & Co.
    Inventors: John S Ng, Claire A Przybyla, Richard A Mueller, Michael L Vazquez, Daniel P Getman, John J Freskos, Gary A DeCrescenzo, Deborah E Bertenshaw, Robert M Heintz, Suhong Zhang, Chin Liu, Scott A Laneman
  • Method of preparing intermediates for retroviral protease inhibitors
    Patent number: 5872299
    Abstract: A synthesis is described for intermediates which are readily amenable to the large scale preparation of hydroxyethylurea-based chiral HIV protease inhibitors. The method includes forming a diastereoselective epoxide or cyanohydrin from a chiral alpha amino aldehyde.
    Type: Grant
    Filed: May 8, 1997
    Date of Patent: February 16, 1999
    Assignee: G. D. Searle & Co.
    Inventors: John S Ng, Claire A Przybyla, Richard A Mueller, Michael L Vazquez, Daniel P Getman, John J Freskos, Gary A DeCrescenzo, Deborah E Bertenshaw, Robert M Heintz, Suhong Zhang, Chin Liu, Scott A Laneman
  • Method for making intermediates useful in the synthesis of retroviral protease inhibitors
    Patent number: 5648511
    Abstract: A synthesis is described for intermediates which are readily amenable to the large scale preparation of hydroxyethylurea-based chiral HIV protease inhibitors. The method includes forming a diastereoselective epoxide or cyanohydrin from a chiral alpha amino aldehyde.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: July 15, 1997
    Assignee: G.D. Searle & Co.
    Inventors: John S. Ng, Claire A. Przybyla, Richard A. Mueller, Michael L. Vazquez, Daniel P. Getman, John J. Freskos, Gary A. DeCrescenzo, Deborah E. Bertenshaw, Robert M. Heintz, Suhong Zhang, Chin Liu, Scott A. Laneman