Patents by Inventor C. Bruce McAllister

C. Bruce McAllister 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 and method of ion detection using electron multiplier over a range of high pressures
    Patent number: 5866901
    Abstract: Ions in a chamber or space are detected using an electron multiplier operating at relatively low gain. The electron multiplier is placed in communication with the chamber, such as a chamber of a mass spectrometer, such that ions from the chamber enter the electron multiplier. A bias voltage applied to the multiplier sets the gain of the multiplier. By setting the gain at a relatively low value, the gain of the multiplier remains independent of chamber pressure, such that an accurate pressure measurement is obtained without calibration at a particular pressure or as a function of pressure.
    Type: Grant
    Filed: December 5, 1996
    Date of Patent: February 2, 1999
    Assignee: MKS Instruments, Inc.
    Inventors: Stephen M. Penn, C. Bruce McAllister