Patents by Inventor Hann-Guang Chao

Hann-Guang Chao 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).

  • Cyclopropyl based O- and N- and S-protecting groups
    Patent number: 5536815
    Abstract: The present invention is directed to the use of a cyclopropylmethyl derivative as a protecting group for compounds containing an amino group, carboxy group, amido group, mercapto group or hydroxy group and to the compounds formed having the cyclopropylmethyl moiety as the protecting group.
    Type: Grant
    Filed: March 31, 1994
    Date of Patent: July 16, 1996
    Assignee: Research Corporation Technologies, Inc.
    Inventors: Louis A. Carpino, Hann-Guang Chao