Patents by Inventor Stanley N. Hemstad

Stanley N. Hemstad 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 for making a pitch-based foam
    Patent number: 6315974
    Abstract: A mesophase pitch material having a melting point in excess of 350° C. has a solvent added thereto to provide a solvated mesophase pitch. A low molecular weight solvent is used so that the melting point can be brought low enough to create a carbon foam at a convenient temperature. The solvent is then removed by heat and/or vacuum and, consequently, the pitch reverts to a high melting point of approximately greater than 350° C. The pitch can then be heated or carbonized without an oxidative stabilization step. Alternatively, a solvated mesophase pitch material may be used initially for foaming.
    Type: Grant
    Filed: July 10, 1998
    Date of Patent: November 13, 2001
    Assignee: AlliedSignal Inc.
    Inventors: Neil Murdie, James F. Pigford, Michael D. Wood, Frank Dillon, Charles A. Parker, Stanley N. Hemstad