Patents by Inventor Robert L. Letcher

Robert L. Letcher 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).

  • Enteric encapsulation of ancrod for oral administration
    Patent number: 4729893
    Abstract: Disclosed is a pharmaceutically effective agent and method of use, comprising ancrod which has been incubated with neuraminidase. The neuraminidase-treated ancrod (NTA) can be substituted for ancrod in ancrod therapy, when immunological resistance to the latter has become manifest. Conversely, NTA can be administered initially, and ancrod substituted therefor after NTA resistance becomes manifest. In a second embodiment, the efficacy of ancrod treatment is improved by enterically coated oral administration of native ancrod.
    Type: Grant
    Filed: April 28, 1986
    Date of Patent: March 8, 1988
    Assignee: Robert L. Letcher
    Inventors: Robert L. Letcher, Jeffrey W. Williams