Patents by Inventor David R. Stone

David R. Stone 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).

  • Waveguide having unidrectional illuminance
    Patent number: 10422939
    Abstract: A luminaire includes an optical waveguide having a first surface and a second surface opposite the first surface, and a light source associated with the optical waveguide. At least about 80% of light produced by the light source is directed by the waveguide into an illumination distribution emitted from the first surface of the optical waveguide.
    Type: Grant
    Filed: September 27, 2016
    Date of Patent: September 24, 2019
    Assignee: IDEAL INDUSTRIES LIGHTING LLC
    Inventors: Eric J. Tarsa, David R. Stone, Jean-Claude David Ramey de Sugny
  • Waveguide Having Unidrectional Illuminance
    Publication number: 20170131452
    Abstract: A luminaire includes an optical waveguide having a first surface and a second surface opposite the first surface, and a light source associated with the optical waveguide. At least about 80% of light produced by the light source is directed by the waveguide into an illumination distribution emitted from the first surface of the optical waveguide.
    Type: Application
    Filed: September 27, 2016
    Publication date: May 11, 2017
    Inventors: Eric J. Tarsa, David R. Stone, Jean-Claude David Ramey de Sugny
  • Waveguide Having Unidirectional Illuminance
    Publication number: 20150049511
    Abstract: A luminaire includes an optical waveguide having a first surface and a second surface opposite the first surface, and a light source associated with the optical waveguide. At least about 80% of light produced by the light source is directed by the waveguide into an illumination distribution emitted from the first surface of the optical waveguide.
    Type: Application
    Filed: August 28, 2014
    Publication date: February 19, 2015
    Inventors: Eric J. Tarsa, David R. Stone, Jean-Claude David Ramey de Sugny
  • Mold protection device
    Patent number: 4515544
    Abstract: Sensor arranged to detect the proper placement and quantity of one or more inserts in the cavity of an injection molding machine. The sensor is preferably formed of a spring-biased plunger through one of the cavity shells. A photodetector monitors the movement of the plunger as the cavity-forming shells are closed and activates an alarm signal if the plunger movement is excessive before detection of proper mold closure.
    Type: Grant
    Filed: March 29, 1984
    Date of Patent: May 7, 1985
    Assignee: International Business Machines Corporation
    Inventors: Russell W. Boehm, Robert P. Rippstein, David R. Stone