Patents by Inventor Michael W. Holdren

Michael W. Holdren 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).

  • Thermoelectric cold trap
    Patent number: 6076357
    Abstract: A compact, portable, thermoelectric cold trap for capturing certain gaseous species for analysis in gas chromatographs is disclosed. The U-shaped heat exchanger and T-shaped cold block for holding the adsorbent tube and heater allow the unit to operate over a temperature range from -45.degree. to 300.degree. C. The thermoelectric cold trap is portable and may be retrofitted to new or existing gas chromatographs. The adsorbent tube and heater are also replaceable. A method of assembling the thermoelectric cold trap and a method of operating the thermoelectric cold trap are also disclosed.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: June 20, 2000
    Assignee: Battele Memorial Institute
    Inventors: Michael W. Holdren, Scott N. Danhof, Michael J. Grassi, Joseph A. Stets, G. William Keigley