Patents by Inventor Franz Twaroch

Franz Twaroch 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).

  • Color correcting interference filter
    Patent number: 4145113
    Abstract: An interference filter having a plurality of alternating layers of high and low index of refraction and layer thickness increasing toward the center can compensate for errors in spectral energy distribution produced by an optical system.
    Type: Grant
    Filed: August 5, 1977
    Date of Patent: March 20, 1979
    Assignee: C. Reichert Optische Werke, AG
    Inventors: Guenther Ranninger, Franz Twaroch