Patents by Inventor Cornelis A. van Beest

Cornelis A. van Beest 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).

  • Gas sensor and detection system comprising such a sensor
    Patent number: 4644333
    Abstract: Gas sensor consisting of a housing which is divided into two compartments 3 and 4 by means of a fluid filter 2, e.g. a bed of activated charcoal. Compartment 3 has an inlet channel 5 and contains a first gas-sensitive semiconductor 6, the measuring device. Compartment 4 has an outlet channel 7 and contains a second gas sensitive semiconductor 8, being used as a reference device. The value of the electric resistances of devices 6 and 8 will increase or decrease when the compartments 3 and 4 contain either an oxidizing or a reducing gas. The sensor is used in a gas detection system in which an electronic circuit which follows determines the ratio between said resistances and the ratio of the reference device and a reference resistance. These ratios are subsequently compared to certain limiting values, and when these values are exceeded, a detection signal will be produced.
    Type: Grant
    Filed: October 4, 1984
    Date of Patent: February 17, 1987
    Assignee: Statt der Nederlanden (Stattsbedrijf der Rosterijen, Telegrafie en Telefonie)
    Inventors: Anton W. Barendsz, Cornelis A. van Beest, Robert Leur