Patents by Inventor Dirk L. Steen

Dirk L. Steen 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).

  • Compact dental dispensing tray with sliding cover
    Patent number: 5377823
    Abstract: A dental dispensing tray has a plurality of wells formed in a substrate, along with a cover that is slidably attached to the substrate. The cover transmits at least a portion of the visible light spectrum but does not transmit a substantial portion of actinic radiation that might otherwise prematurely cure photocurable material in the wells.
    Type: Grant
    Filed: January 4, 1994
    Date of Patent: January 3, 1995
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Dirk L. Steen, Malcolm W. Wilcox, Thomas W. Martin