Patents by Inventor Theodorus G. L. Wiefferink

Theodorus G. L. Wiefferink 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).

  • Spectrometer comprising a slit box
    Patent number: 5160975
    Abstract: For exact positioning of optical elements, a spectrometer is provided with a holder which is constructed using plates having a sector of circle shape and a side wall portion comprising a cylindrical surface portion. The cylindrical surface portion is provided with an exactly circular abutment face in which an entrance slot and an exit slot are provided. Relative to this abutment face, an entrance slit and an exit slit can be extremely exactly positioned with respect to one another along an exact circle. The holder is preferably constructed using two axially stacked compartments, in a cylindrical surface portion of which the slot or slots is/are provided between the compartments.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: November 3, 1992
    Assignee: U.S. Philips Corp.
    Inventor: Theodorus G. L. Wiefferink