Patents by Inventor Murray R. Darrach

Murray R. Darrach 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).

  • Detector using mass spectroscopy for characterization of biological community
    Patent number: 8116981
    Abstract: Provided are methods and systems for rapidly and effectively characterizing a cell as belonging to a particular genus, species, strain, or having a particular phenotype. The methods and systems utilize mass spectrometry and low-energy negative ionization to detect cell surface markers indicative of a particular cell.
    Type: Grant
    Filed: May 28, 2003
    Date of Patent: February 14, 2012
    Assignee: California Institute of Technology
    Inventors: Ara Chutjian, Murray R. Darrach, Roger G. Kern
  • Electronic drive and acquisition system for mass spectrometry
    Patent number: 7772550
    Abstract: The present invention discloses an mixed signal RF drive electronics board that offers small, low power, reliable, and customizable method for driving and generating mass spectra from a mass spectrometer, and for control of other functions such as electron ionizer, ion focusing, single-ion detection, multi-channel data accumulation and, if desired, front-end interfaces such as pumps, valves, heaters, and columns.
    Type: Grant
    Filed: May 3, 2007
    Date of Patent: August 10, 2010
    Assignee: California Institute of Technology
    Inventors: Rembrandt Thomas Schaefer, Mohammad Mojarradi, Ara Chutjian, Murray R. Darrach, John MacAskill, Tuan Tran, Gary R. Burke, Stojan M. Madzunkov, Brent R. Blaes, John L. Thomas, Ryan A. Stern, David Q. Zhu
  • Chemical sensor system
    Patent number: 7332345
    Abstract: A chemical sensing apparatus and method for the detection of sub parts-per-trillion concentrations of molecules in a sample by optimizing electron utilization in the formation of negative ions is provided. A variety of media may be sampled including air, seawater, dry sediment, or undersea sediment. An electrostatic mirror is used to reduce the kinetic energy of an electron beam to zero or near-zero kinetic energy.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: February 19, 2008
    Assignee: California Institute of Technology
    Inventors: Murray R. Darrach, Ara Chutjian
  • Novel detector using mass spectroscopy for characterization of biological community
    Publication number: 20040049107
    Abstract: Provided are methods and systems for rapidly and effectively characterizing a cell as belonging to a particular genus, species, strain, or having a particular phenotype. The methods and systems utilize mass spectrometry and low-energy negative ionization to detect cell surface markers indicative of a particular cell.
    Type: Application
    Filed: May 28, 2003
    Publication date: March 11, 2004
    Inventors: Ara Chutjian, Murray R. Darrach, Roger G. Kern
  • High-efficiency electron ionizer for a mass spectrometer array
    Patent number: 6521898
    Abstract: The present invention provides an improved electron ionizer for use in a quadrupole mass spectrometer. The improved electron ionizer includes a repeller plate that ejects sample atoms or molecules, an ionizer chamber, a cathode that emits an electron beam into the ionizer chamber, an exit opening for excess electrons to escape, at least one shim plate to collimate said electron beam, extraction apertures, and a plurality of lens elements for focusing the extracted ions onto entrance apertures.
    Type: Grant
    Filed: July 10, 2001
    Date of Patent: February 18, 2003
    Assignee: California Institute of Technology
    Inventors: Ara Chutjian, Murray R. Darrach, Otto J. Orient
  • High-efficiency electron ionizer for a mass spectrometer array
    Publication number: 20010038077
    Abstract: The present invention provides an improved electron ionizer for use in a quadrupole mass spectrometer. The improved electron ionizer includes a repeller plate that ejects sample atoms or molecules, an ionizer chamber, a cathode that emits an electron beam into the ionizer chamber, an exit opening for excess electrons to escape, at least one shim plate to collimate said electron beam, extraction apertures, and a plurality of lens elements for focusing the extracted ions onto entrance apertures.
    Type: Application
    Filed: July 10, 2001
    Publication date: November 8, 2001
    Applicant: California Institute of Technology, a non-profit organization
    Inventors: Ara Chutjian, Murray R. Darrach, Otto J. Orient
  • High-efficiency electron ionizer for a mass spectrometer array
    Patent number: 6271527
    Abstract: The present invention provides an improved electron ionizer for use in a quadrupole mass spectrometer. The improved electron ionizer includes a repeller plate that ejects sample atoms or molecules, an ionizer chamber, a cathode that emits an electron beam into the ionizer chamber, an exit opening for excess electrons to escape, at least one shim plate to collimate said electron beam, extraction apertures, and a plurality of lens elements for focusing the extracted ions onto entrance apertures.
    Type: Grant
    Filed: June 6, 2000
    Date of Patent: August 7, 2001
    Assignee: California Institute of Technology
    Inventors: Ara Chutjian, Murray R. Darrach, Otto J. Orient
  • High-efficiency electron ionizer for a mass spectrometer array
    Patent number: 6072182
    Abstract: The present invention provides an improved electron ionizer for use in a quadrupole mass spectrometer. The improved electron ionizer includes a repeller plate that ejects sample atoms or molecules, an ionizer chamber, a cathode that emits an electron beam into the ionizer chamber, an exit opening for excess electrons to escape, at least one shim plate to collimate said electron beam, extraction apertures, and a plurality of lens elements for focusing the extracted ions onto entrance apertures.
    Type: Grant
    Filed: October 1, 1998
    Date of Patent: June 6, 2000
    Assignee: California Institute of Technology
    Inventors: Ara Chutjian, Murray R. Darrach, Otto J. Orient