Patents by Inventor Grafton K. Barbson

Grafton K. Barbson 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).

  • Twin-beam luminaire lens
    Patent number: 4053762
    Abstract: A luminaire lens is provided with a prism arrangement which emits light in two beams. A two-light tube fixture is utilized with approximately the same amount of light coming from the 0.degree. to 30.degree. zone of candlepower distribution and the 30.degree. to 60.degree. zone of candlepower distribution, with very little light emitted from the 60.degree. to 90.degree. zone of candlepower distribution.
    Type: Grant
    Filed: December 29, 1975
    Date of Patent: October 11, 1977
    Assignee: Armstrong Cork Company
    Inventor: Grafton K. Barbson