Patents by Inventor David O. Hall

David O. Hall 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).

  • Solid phase extraction plate with silica disks
    Patent number: 6200533
    Abstract: A solid phase extraction plate includes a unitary tray having a plurality of spaced-apart discrete upstanding chambers molded therein with each chamber having a top opening and a bottom nozzle with downwardly tapering sidewalls extending between the top opening and the bottom nozzle. A plurality of solid phase extraction disks are provided and one secured in each of the plurality of chambers without the use of frits or retainer rings utilizing instead tapered sidewalls of the chamber for enabling a press fit of the disks therein.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: March 13, 2001
    Assignee: Ansys Diagnostics, Inc.
    Inventors: Dennis D. Blevins, Stephen K. Schultheis, David O. Hall