Patents by Inventor David M. Shelow

David M. Shelow 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).

  • Sleeve units for inlet splitters of capillary gas chromatographs
    Patent number: 5119669
    Abstract: A sleeve unit for converting a liquid sample into a sample gas and for mixing the sample gas and a carrier gas into a uniform gas mixture and delivering the gas mixture to the inlet end of a capillary tube of a gas chromatograph comprises a tubular liner having a bore, an inlet expansion chamber in the bore for changing a liquid sample into a sample gas, a mixing chamber in the bore next to the inlet chamber, a spiral core baffle inside the mixing chamber for thoroughly mixing the sample gas and the carrier gas into a uniform gas mixture by guiding the sample gas and the carrier gas into a spiral path around the spiral core baffle between the baffle and the liner, and an outlet chamber next to the mixing chamber for delivering the thoroughly mixed sample and carrier gases to an inlet end of a capillary tube of a gas chromatograph.
    Type: Grant
    Filed: July 31, 1990
    Date of Patent: June 9, 1992
    Assignee: Restek Corporation
    Inventors: Paul H. Silvis, Joseph W. Walsh, David M. Shelow