Patents by Inventor Hans P. Weihe

Hans P. Weihe 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 operating an exposure apparatus and exposure apparatus for conducting this process
    Patent number: 4922078
    Abstract: A process and apparatus for obtaining uniform light distribution in an exposure apparatus having at least one fluorescent light tube involves heating the light tube along most of its length to a temperature above ambient temperature prior to activating the exposure apparatus. A heater is disposed on the back of a transparent partition and a blower is provided for circulating hot air.
    Type: Grant
    Filed: August 24, 1988
    Date of Patent: May 1, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Peter Ulrich, Hans P. Weihe
  • X-ray film cassette for daylight system
    Patent number: 4734926
    Abstract: The disclosure involves an X-ray daylight cassette with shortened unloading times. The cassette, which has a film insertion slot on one side, contains two intensifying screens, one of which is affixed to the pressure plate so that the screen has edge zones that are not bonded to the pressure plate on the two long dimensions and optionally, on the short dimension opposite the film insertion slot.
    Type: Grant
    Filed: May 20, 1986
    Date of Patent: March 29, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Rudolf Singer, Hans P. Weihe