Patents by Inventor Willi Apel

Willi Apel 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).

  • Photometer for measuring hot gases
    Patent number: 4671664
    Abstract: A photometer includes a radiation source, a measuring chamber and a receiver, all arranged in a casing and through coupling-decoupling members definite temperature gradients are produced between the measuring chamber and the receiver-transmitter and other gradients through appropriate coupling members are established towards the cooled housing.
    Type: Grant
    Filed: September 5, 1985
    Date of Patent: June 9, 1987
    Assignee: Hartmann & Braun AG
    Inventors: Walter Fabinski, Willi Apel, Guenter Bernhardt, Rudolf Jezdinsky, Heinz Wolf