Patents by Inventor David E. Clouser

David E. Clouser 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).

  • Modulated fluid detector
    Patent number: 4254654
    Abstract: A sample fluid and a reference fluid are alternately applied to a fluid detector and an output signal is derived that is proportional to the difference between the response of the detector to the fluids.
    Type: Grant
    Filed: October 7, 1976
    Date of Patent: March 10, 1981
    Assignee: Hewlett-Packard Company
    Inventors: David E. Clouser, John S. Craven
  • Method for extending transistor logarithmic conformance
    Patent number: 4232233
    Abstract: The linear component appearing in the output of two logarithmic amplifiers connected for temperature compensation and having matched feedback semiconductor devices is cancelled in a resistor connected in series with a logarithmic device between the output and a point of reference potential so that a purely logarithmic voltage appears at their junction.
    Type: Grant
    Filed: December 29, 1978
    Date of Patent: November 4, 1980
    Assignee: Hewlett-Packard Company
    Inventors: David E. Clouser, Steven J. Engel
  • Phase discrimination in modulated thermal conductivity detector
    Patent number: 4185490
    Abstract: A thermal conductivity detector in which sample gas and reference gas are made to alternately flow through a thermal conductive cell at a given switching frequency and in which the output signal is applied to a synchronous detector wherein it is mixed with a control wave that is in phase quadrature with the flow component of the output signal.
    Type: Grant
    Filed: October 6, 1978
    Date of Patent: January 29, 1980
    Assignee: Hewlett-Packard Company
    Inventors: David E. Clouser, John S. Craven