Patents by Inventor Elmer Eugene Prothero

Elmer Eugene Prothero 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).

  • Illuminated emergency sign utilizing LED units
    Patent number: 5729925
    Abstract: An emergency exit sign has a housing in which a pair of LED units are disposed. Each LED unit has two rows of diodes, the rows connected in reverse polarity to an A.C. source so that said rows are illuminated alternatingly. A diffuser plate disposed between the LED units and a stencil plate is formed of a translucent plastic material having a light transmittance frequency to the peak wavelength of light emitted from the diodes. The diodes are exposed to the diffuser plate so that the diffuser plate receives both direct and indirect light therefrom.
    Type: Grant
    Filed: March 16, 1995
    Date of Patent: March 24, 1998
    Assignee: Cooper Industries, Inc.
    Inventor: Elmer Eugene Prothero