Patents by Inventor Frank S. Barthel

Frank S. Barthel 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).

  • Luminaire and reflector therefor
    Patent number: 4027151
    Abstract: A luminaire for providing uniform illumination of a horizontal or vertical plane surface is provided with a reflector having three distinct contours to provide optimum distribution of light flux. The first section is cylindrical and extends from 117.degree. to 180.degree. from nadir. The second section is a general contour curve extending from 180.degree. to 270.degree. from nadir and is used to redirect flux in the zone from nadir to 65.degree.. The third section is a general contour curve extending from 270.degree. to 355.degree. from nadir and redirects the flux in the zone from 50.degree. to 65.degree. from nadir. The general contour curves in sections 2 and 3 are defined by fourth degree polynominal equations.
    Type: Grant
    Filed: November 18, 1975
    Date of Patent: May 31, 1977
    Assignee: Crouse-Hinds Company
    Inventor: Frank S. Barthel