Patents by Inventor Harry I. A. Rudberg

Harry I. A. Rudberg 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 measuring low concentrations of chlorine and chlorine oxide
    Patent number: 4196427
    Abstract: A semiconductor sensor element having two filaments of a noble metal, preferably platinum, embedded in spaced apart relation in a body of titanium oxide. One of the filaments serves as a sensing filament. The other filament is supplied with current at a high voltage, suitably about 100 volts. The resistance of the sensing filament increases sharply in the presence of gaseous chlorine or chlorine compounds, and this change in resistance is used to actuate an alarm or the like.
    Type: Grant
    Filed: January 9, 1978
    Date of Patent: April 1, 1980
    Inventor: Harry I. A. Rudberg