Ara A Chutjian

6434031, Aug 13, 2002

Mar 20, 2001

09/813654

Ara Chutjian - La Crescenta CA
Dean Aalami - Irvine CA
Murray Darrach - Arcadia CA
Otto Orient - Glendale CA

California Institute of Technology - Pasadena CA

H01J 3700

363 97, 363 25, 363134, 250292

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.

6469299, Oct 22, 2002

Jun 26, 2001

09/892313

Ara Chutjian - La Crescenta CA
Stephen D. Fuerstenau - Montrose CA
Otto J. Orient - Glendale CA
Karl Y. Yee - Pasadena CA
John T. Rice - Pasadena CA

California Institute of Technology - Pasadena CA

H01J 4942

250292

The present invention provides a quadrupole mass spectrometer and an ion filter, or pole array, for use in the quadrupole mass spectrometer. The ion filter includes a thin patterned layer including a two-dimensional array of poles forming one or more quadrupoles. The patterned layer design permits the use of very short poles and with a very dense spacing of the poles, so that the ion filter may be made very small. Also provided is a method for making the ion filter and the quadrupole mass spectrometer. The method involves forming the patterned layer of the ion filter in such a way that as the poles of the patterned layer are formed, they have the relative positioning and alignment for use in a final quadrupole mass spectrometer device.

6521898, Feb 18, 2003

Jul 10, 2001

09/903475

Ara Chutjian - La Crescenta CA
Murray R. Darrach - Arcadia CA
Otto J. Orient - Glendale CA

California Institute of Technology - Pasadena CA

H01J 4914

250427, 250423 R, 250288

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.

6583702, Jun 24, 2003

Jun 5, 2002

10/165252

Ara Chutjian - La Crescenta CA
Dean Aalami - Irvine CA
Murray Darrach - Arcadia CA
Otto Orient - Glendale CA

California Institute of Technology - Pasadena CA

H01E 2734

336181, 250292

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.

7332345, Feb 19, 2008

Nov 12, 2002

10/293966

Murray R. Darrach - Valencia CA, US
Ara Chutjian - La Crescenta CA, US

California Institute of Technology - Pasadena CA

H01J 49/04
G06F 17/50
G01N 33/22
B01D 59/44

436173, 250281, 250282, 250288, 250427, 436 96, 436 98, 436104, 436107, 436110, 436124, 703 13, 703 22

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.

7772550, Aug 10, 2010

May 3, 2007

11/800421

Rembrandt Thomas Schaefer - Pasadena CA, US
Mohammad Mojarradi - La Canada CA, US
Ara Chutjian - La Crescenta CA, US
Murray R. Darrach - Valencia CA, US
John MacAskill - Pasadena CA, US
Tuan Tran - Upland CA, US
Gary R. Burke - Moorpark CA, US
Stojan M. Madzunkov - Monrovia CA, US
Brent R. Blaes - San Dimas CA, US
John L. Thomas - Duarte CA, US
Ryan A. Stern - Los Angeles CA, US
David Q. Zhu - Pasadena CA, US

California Institute of Technology - Pasadena CA

H01J 49/26

250290, 250281, 250282

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.

8116981, Feb 14, 2012

May 28, 2003

10/447674

Ara Chutjian - La Crescenta CA, US
Murray R. Darrach - Valencia CA, US
Roger G. Kern - Alhambra CA, US

California Institute of Technology - Pasadena CA

G01N 33/48
B01D 59/44

702 19, 250307

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.

52568741, Oct 26, 1993

Mar 25, 1992

7/857378

Ara Chutjian - La Crescenta CA

California Institute of Technology - Pasadena CA

H01J 4904

250288

A gridded electron reversal ionizer forms a three dimensional cloud of zero or near-zero energy electrons in a cavity within a filament structure surrounding a central electrode having holes through which the sample gas, at reduced pressure, enters an elongated reversal volume. The resultant negative ion stream is applied to a mass analyzer. The reduced electron and ion space-charge limitations of this configuration enhances detection sensitivity for material to be detected by electron attachment, such as narcotic and explosive vapors. Positive ions may be generated by generating electrons having a higher energy, sufficient to ionize the target gas and pulsing the grid negative to stop the electron flow and pulsing the extraction aperture positive to draw out the positive ions.