Patents by Inventor Ray W. Blasingame

Ray W. Blasingame 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).

  • Optical switch with tamper indicating feature for discouraging the use of an external light source to defeat the intended operation of the optical switch
    Patent number: 5414254
    Abstract: An optical switch, or detector, is provided with a light source and a light sensitive component. The light source, which can be an infrared light emitting diode, and the light sensitive component, which can be a photodarlington pair, are associated to provide an equilibrium light emission from the light emitting diode which is sufficient to maintain conductance through the light sensitive component which regulates the amount of current flowing through the light emitting diode. This cooperative association between these components results in an equilibrium condition that is disturbed by the existence of an object between these components to obstruct the light beam between the light source and the light sensitive component, or an external light source providing a beam of light received by the light sensitive component. The voltage magnitude at the light source can be used as a signal representing the condition as the light sensitive component.
    Type: Grant
    Filed: April 22, 1993
    Date of Patent: May 9, 1995
    Assignee: Honeywell Inc.
    Inventors: Ray W. Blasingame, James H. May