Patents by Inventor Gregory S. Lewer

Gregory S. Lewer 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).

  • Low-glare overhead projector
    Patent number: 4118114
    Abstract: An overhead projector that uses as a condensing lens a linear echelon lens structure comprising a combination of linear echelon lens elements between the light source and stage of the projector to minimize glare emanating from the condensing lens.
    Type: Grant
    Filed: June 21, 1976
    Date of Patent: October 3, 1978
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Raymond H. Anderson, Gregory S. Lewer