Patents by Inventor Willi Stahlhofen

Willi Stahlhofen 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 apparatus for determining the deposition of particles in the respiratory tract and/or for checking the function of the respiratory tract
    Patent number: 4370986
    Abstract: A method and apparatus for determining the deposition of particles in the respiratory tract and/or for checking the operating function of the respiratory tract by means of pulses of gases or aerosols injected into a stream of air inhaled by a test patient and by obtaining a measuring signal in each of the inhaled and exhaled streams. The main stream of the inhaled and exhaled air is conducted directly through a band of light (3), and the region of the intersection of the band of light with at least part of the inhaled and exhaled streams is placed in the object plane of an optical image system for a light measuring device. Either the individual pulses generated by the individual particles in the inhaled and exhaled streams or the scattered radiation emanating from the gases and aerosols in these streams is measured to obtain the ratio of the exhaled to the inhaled numbers of particles and/or the concentration profile in the inhaled and exhaled streams.
    Type: Grant
    Filed: September 26, 1980
    Date of Patent: February 1, 1983
    Assignee: Gesellschaft fur Strahlen-und Umweltforschung mbH Munchen
    Inventors: Josef Gebhart, Gerhard Heigwer, Joachim Heyder, Willi Stahlhofen