Patents by Inventor John R. Reeher

John R. Reeher 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).

  • Mass spectrometer system and method for control of ion energy for different masses
    Patent number: 4214160
    Abstract: Apparatus and method for programming the ion energy of ions being analyzed by a quadruple mass spectrometer where the axis potential applied to the quadruple rods is caused to vary in synchronism with a mass scan in order that the ions of each mass being analyzed may transit the quadruple with the most advantageous energy for proper analysis (that is, with substantially equal velocities) and the application of the ion scan voltage will not distort the fringing field at the entrance to the quadrupole.
    Type: Grant
    Filed: March 4, 1976
    Date of Patent: July 22, 1980
    Assignee: Finnigan Corporation
    Inventors: William J. Fies, Ronald D. Smith, John R. Reeher, Michael S. Story
  • Combined vacuum baffle and valve for diffusion pump
    Patent number: 4081222
    Abstract: In a vacuum system a baffle-valve acts first as a baffle to reduce the backstreaming of a diffusion pump fluid into the main vacuum chamber being evacuated and secondly it can be used as a valve to provide complete isolation between the diffusion pump and the vacuum chamber. This enables the chamber to be open for service work while the diffusion pump is kept operating for rapid pump down. The foregoing dual use of the baffle/valve increases pumping efficiency because of higher conductance.
    Type: Grant
    Filed: March 4, 1976
    Date of Patent: March 28, 1978
    Assignee: Finnigan Corporation
    Inventors: Ronald D. Smith, Steven B. Frankel, John R. Reeher, Michael S. Story
  • Focusing ion lens system for mass spectrometer for separating charged and neutral particles
    Patent number: 4075479
    Abstract: In a mass spectrometer a focusing ion lens system effectively separates charged from neutral particles by forming a potential well along the axis from the ionizing region to the mass analyzer by the use of a gridded lens system. The grids by the use of a high-low voltage combination form the potential well while at the same time allowing nonselected neutral particles to pass through the grid. Thus, the system is very effective for relatively high pressure ionizing regions where a large amount of neutral particles are generated.
    Type: Grant
    Filed: March 4, 1976
    Date of Patent: February 21, 1978
    Assignee: Finnigan Corporation
    Inventors: John R. Reeher, Michael S. Story, Ronald D. Smith
  • Temperature stable multipole mass filter and method therefor
    Patent number: 4032782
    Abstract: A method of selecting a material for the construction of a multipole mass filter that is temperature stable or in other words, the R.sub.o parameter remains invariant with change in temperature. The coefficients of thermal expansion of the quadrupole rods and mounting structure are chosen so that a constant ratio of the two is provided which in turn is determined by the geometrical construction of the filter.
    Type: Grant
    Filed: June 4, 1976
    Date of Patent: June 28, 1977
    Assignee: Finnigan Corporation
    Inventors: Ronald D. Smith, William J. Fies, John R. Reeher, Michael S. Story