Patents by Inventor Terrence S. Hahn

Terrence S. Hahn 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).

  • Vapor phase uphill quenching of metal alloys using fluorochemicals
    Patent number: 4968358
    Abstract: Uphill quenching of metal alloys, such as aluminum alloys, is improved by conducting the heating step, after the quench-cooling step of the uphill quenching, using the elevated temperature vapor of a fluorochemical compound, preferably a perfluorocarbon compound. The vapor formed over a boiling bath of the perfluorocarbon compound comprises the heat source when it condenses on the relatively cooler alloy thus imparting its heat of condensation to the alloy.
    Type: Grant
    Filed: October 25, 1989
    Date of Patent: November 6, 1990
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Mark A. Pellman, Paul T. Kilhefner, III, Willliam J. Baxter, Terrence S. Hahn
  • Removing pattern material from investment casting molds
    Patent number: 4940072
    Abstract: Pattern material, such as wax, is removed from an investment casting mold by vapor phase-condensation heating with a fluorochemical boiling at a temperature above the melting point of the pattern material.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: July 10, 1990
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Mark A. Pellman, Paul T. Kilhefner, III, Terrence S. Hahn