Patents by Inventor Rolf H. Hubner

Rolf H. Hubner 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).

  • Apparatus for monitoring the solvent content of air
    Patent number: 4111034
    Abstract: An apparatus for monitoring the solvent content of air, especially for detecting the presence of perchloroethylene or trichloroethylene in association with a drycleaning plant, for measuring the concentration of the solvent and/or for triggering an alarm in the event a solvent concentration exceeds a predetermined limit. The sensor comprises a metal oxide semiconductor electrically heated to a predetermined temperature and having a surface exposed to the solvent molecules in the air so that its electrical resistance or conductivity changes as a function of the solvent concentration.
    Type: Grant
    Filed: April 7, 1977
    Date of Patent: September 5, 1978
    Inventor: Rolf H. Hubner