Patents by Inventor Graham J. Griffiths

Graham J. Griffiths 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).

  • Catalyst sampling device
    Patent number: 4916956
    Abstract: A system for exposing a sample to the interior of a reaction vessel has a pair of chambers interconnected by a passage. Each of the chambers may be isolated by valves with the outer chamber being removable. A sample holder is slidable between the chambers by a charging device and can be locked in place by rotation of the charging device. Flights on the interior of the passage provide guidance and facilitate locking.
    Type: Grant
    Filed: March 20, 1989
    Date of Patent: April 17, 1990
    Assignee: Polysar Limited
    Inventors: Henry J. Semerak, Lawrence M. Schmidt, Graham J. Griffiths