Patents by Inventor Ralph W. Hodges, Jr.

Ralph W. Hodges, Jr. 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).

  • Preparation of polymethylene polyphenyl polyisocyanate
    Patent number: 5136087
    Abstract: Disclosed herein is an improved process for the preparation of polymethylene polyphenyl polyisocyanate by reacting phosgene with a corresponding polyamine, followed by removing residual phosgene from the reaction mixture, the improvement comprising removing the residual phosgene by contacting the reaction mixture which is maintained at 150 degrees Centigrade or lower, with an inert solvent vapor stream at a temperature which is sufficient to effect a substantially complete removal of the residual phosgene.
    Type: Grant
    Filed: May 15, 1991
    Date of Patent: August 4, 1992
    Assignee: Miles Inc.
    Inventors: Irvin Van Horn, Ralph W. Hodges, Jr., Susan M. Strausser