Patents by Inventor Daniel C. Dennison

Daniel C. Dennison 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).

  • Automatic blackboard eraser apparatus
    Patent number: 5216776
    Abstract: An eraser includes a track structure to permit reciprocation of an eraser housing laterally of an elongate blackboard plate. The eraser housing includes a drive motor to effect rotation of a drive brush positioned above the blackboard plate, including a dust collection housing and tension roller positioned below the brush housing.
    Type: Grant
    Filed: January 27, 1992
    Date of Patent: June 8, 1993
    Inventor: Daniel C. Dennison