Patents by Inventor David W. Ginn

David W. Ginn 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).

  • Auto-threshold slow start control circuit for a centrifuge
    Patent number: 4390825
    Abstract: This invention relates to a slow start control network which includes a field effect transistor triggered by the voltage across a charging capacitor. The field effect transistor permits current flow through a portion of an associated centrifuge drive motor control arrangement. A supplemental charging current source is provided to assist the charging of the capacitor to the triggering signal level within a predetermined short delay time.
    Type: Grant
    Filed: June 26, 1981
    Date of Patent: June 28, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: David W. Ginn