Patents by Inventor Eberhardt Heidrich

Eberhardt Heidrich 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).

  • Method and an arrangement for measuring distances using the reflected beam principle
    Patent number: 5387918
    Abstract: For distance measurement using the reflected beam principle a transmission wave is transmitted with a periodically frequency modulated transmission frequency. The echo wave reflected at the target has a reception frequency which is periodically frequency modulated in the same manner, there being a transit time dependent frequency difference between the transmission frequency and the reception frequency, such frequency difference being the distance frequency which is determined as measure of the distance of the target from the transmission/reception location. Using a constant reference frequency the transmission frequency and the reception frequency are converted in a common mixer to give a transmission/reception intermediate frequencies mixture, which includes a transmission intermediate frequency formed by conversion of the transmission frequency using the reference frequency, and a reception intermediate frequency formed by conversion of the reception frequency using the reference frequency.
    Type: Grant
    Filed: December 11, 1992
    Date of Patent: February 7, 1995
    Assignee: Endress & Hauser GmbH & Co.
    Inventors: Werner Wiesbeck, Jurgen Kehrbeck, Eberhardt Heidrich