Patents by Inventor Douglas Frederick Kreysar

Douglas Frederick Kreysar 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).

  • Process for the design of free form reflectors which accounts for manufacturing tolerances
    Patent number: 5675495
    Abstract: A process for computer-assisted-design of an optical element allows for anticipation of errors that may arise in the actual manufacture of the element. A known optical design program is first operated to determine data representing the physical characteristics of the element that will provide a desired optical output. Then, the data representing the optimum physical characteristics are modified in accordance with a statistical distribution that represents the errors in the physical elements that are expected in the actual manufacture of the physical elements. The optical output is then determined for an optical element having the modified physical characteristics. This modified optical output is compared with the desired optical output to determine whether the designed optical element will produce the desired optical output when manufactured.
    Type: Grant
    Filed: May 18, 1995
    Date of Patent: October 7, 1997
    Assignee: Hella K.G. Hueck & Co.
    Inventors: Gerhard Biermann, Douglas Frederick Kreysar, Ben Wang