Patents by Inventor Keith G. Hetrick

Keith G. Hetrick 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).

  • Image display control panel for overhead projectors
    Patent number: 5172144
    Abstract: An attachment device for overhead projectors which permits blocking of the image display by changing the position of an opaque panel wherein the device is frictionally attached to the projection head. The opaque panel of heat transmitting foil is hingedly attached to a hood. The sides of the hood extend downwardly and are biased inwardly to engage the projection head.
    Type: Grant
    Filed: March 4, 1992
    Date of Patent: December 15, 1992
    Inventor: Keith G. Hetrick