Patents by Inventor Murray Darrach

Murray 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).

  • Electronic drive and acquisition system for mass spectrometry
    Publication number: 20080001083
    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: Application
    Filed: May 3, 2007
    Publication date: January 3, 2008
    Inventors: Rembrandt Schaefer, Mohammad Majrradi, Ara Chutjian, Murray Darrach, John MacAskill, Tuan Tran, Gary Burke, Stojan Madzunkov, Brent Blaes, John Thomas, Ryan Stern, David Zhu
  • Chemical sensor system
    Publication number: 20050170523
    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: Application
    Filed: November 12, 2002
    Publication date: August 4, 2005
    Inventors: Murray Darrach, Ara Chutjian
  • Quadrupole mass spectrometer driver with higher signal levels
    Patent number: 6583702
    Abstract: Driving a quadrapole mass spectrometer includes obtaining an air core transformer with a primary and a secondary, matching the secondary to the mass spectrometer, and driving the primary based on first and second voltage levels. Driving of the primary is via an isolating stage that minimizes low level drive signal coupling.
    Type: Grant
    Filed: June 5, 2002
    Date of Patent: June 24, 2003
    Assignee: California Institute of Technology
    Inventors: Ara Chutjian, Dean Aalami, Murray Darrach, Otto Orient
  • Driving a quadrapole mass spectrometer via an isolating stage
    Publication number: 20020154517
    Abstract: Driving a quadrapole mass spectrometer includes obtaining an air core transformer with a primary and a secondary, matching the secondary to the mass spectrometer, and driving the primary based on first and second voltage levels. Driving of the primary is via an isolating stage that minimizes low level drive signal coupling.
    Type: Application
    Filed: June 5, 2002
    Publication date: October 24, 2002
    Applicant: California Institute of Technology
    Inventors: Ara Chutjian, Dean Aalami, Murray Darrach, Otto Orient
  • Driving a quadrupole mass spectrometer via an isolating stage
    Patent number: 6434031
    Abstract: Driving a quadrupole mass spectrometer includes obtaining an air core transformer with a primary and a secondary, matching the secondary to the mass spectrometer, and driving the primary based on first and second voltage levels. Driving of the primary is via an isolating stage that minimizes low level drive signal coupling.
    Type: Grant
    Filed: March 20, 2001
    Date of Patent: August 13, 2002
    Assignee: California Institute of Technology
    Inventors: Ara Chutjian, Dean Aalami, Murray Darrach, Otto Orient
  • DRIVING A QUADRPOLE MASS SPECTROMETER VIA AN ISOLATING STAGE
    Publication number: 20010023923
    Abstract: A power supply for a quadrupole mass spectrometer which operates using an RF signal. The RF signal is controllable via a feedback loop. The feedback loop is from the output, through a comparator, and compared to a digital signal. An air core transformer is used to minimize the weight. The air core transformer is driven via two out of phase sawtooth signals which drive opposite ends of the transformer.
    Type: Application
    Filed: March 20, 2001
    Publication date: September 27, 2001
    Applicant: California Institute of Technology
    Inventors: Ara Chutjian, Dean Aalami, Murray Darrach, Otto Orient
  • Power supply with air core transformer and seperated power supplies for high dynamic range
    Patent number: 6205043
    Abstract: A power supply for a quadrupole mass spectrometer which operates using an RF signal. The RF signal is controllable via a feedback loop. The feedback loop is from the output, through a comparator, and compared to a digital signal. An air core transformer is used to minimize the weight. The air core transformer is driven via two out of phase sawtooth signals which drive opposite ends of the transformer.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: March 20, 2001
    Assignee: California Institute of Technology
    Inventors: Ara Chutjian, Dean Aalami, Murray Darrach, Otto Orient