Patents by Inventor Charles K. Langhorn

Charles K. Langhorn 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).

  • Laser blocking filter with neutral transmission color
    Patent number: 5966240
    Abstract: A filter system for reflectively blocking laser radiation in the visible spectrum includes a multilayer interference structure arranged for reflectively blocking a continuous band of wavelengths including the laser radiation and transmitting other wavelengths in the visible spectrum. The filter system is arranged to control transmission of the other wavelengths of the visible spectrum such that the filter system has an essentially neutral transmission color and maximum photopic transmission consistent with the band of wavelengths reflectively blocked.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: October 12, 1999
    Assignee: Coherent, Inc.
    Inventors: Mark H. Lange, Charles K. Langhorn, Dennis G. Fischer, Bruce E. Perilloux