Steven M West

US Patent:

6350367, Feb 26, 2002

Filed:

Oct 23, 1998

Appl. No.:

09/178011

Inventors:

Steven J. West - Hull MA

Assignee:

Orion Research, Inc. - Beverly MA

International Classification:

G01N 2726

US Classification:

205775, 204400, 204416, 436 8

Abstract:

The present invention is directed to a stable, non-hazardous solution for calibrating oxidation-reduction potential (ORP) measurement cells. The redox standard calibration solution of the present invention consists essentially of an aqueous solution containing the triiodide/iodide redox couple. In a preferred embodiment, the solution of the present invention consists essentially of an aqueous solution containing up to about 0. 01 moles per liter of iodine (I ) and at least about 1 mole per liter of potassium iodide. In a most preferred embodiment, the solution of the present invention consists of an aqueous solution of 4 molar potassium iodide (KI) and 0. 0067 molar iodine (I ).

US Patent:

6793787, Sep 21, 2004

Filed:

Mar 15, 2002

Appl. No.:

10/098687

Inventors:

Moshe Hirshberg - Brookline MA
Steven J. West - Hull MA
James Barbookles - Ipswich MA

Assignee:

Orion Research, Inc. - Beverly MA

International Classification:

G01N 27333

US Classification:

204416, 204420

Abstract:

An improved ion-selective electrode with enhanced sensitivity and reliability. The electrode is readily formed from an electrode assembly sealingly joined to the upper end of an electrode chamber whose lower end opens into in a tube bore of substantial path length that provides a conductive path between the electrode assembly and a sensing tip of the electrode. The electrode assembly itself takes the form of a generally helical coil formed on a post extending from the upper end of the assembly and positioning a substantial length of conductive lead remote from the sensing tip of the electrode. The electrode chamber is thermally insulated from the main body of the electrode, and adverse temperature effects are thus greatly minimized. A self-cleaning junction has also been developed. Increased reliability for a given sensitivity have been found to result from the construction.

US Patent:

7276142, Oct 2, 2007

Filed:

Feb 12, 2002

Appl. No.:

10/074219

Inventors:

Steven J. West - Hull MA, US
Moshe Hirshberg - Brookline MA, US

Assignee:

Thermo Orion Inc. - Beverly MA

International Classification:

G01N 27/36
G01N 27/403

US Classification:

204433, 204435

Abstract:

Disclosed are combination glass pH electrodes, the standard potential of which is stabilized by means one or more of the following structural modifications:.

US Patent:

7323091, Jan 29, 2008

Filed:

Sep 24, 2003

Appl. No.:

10/669454

Inventors:

Timothy C. Gillette - Brookline MA, US
Steven J. West - Hull MA, US

Assignee:

Orion Research, Inc. - Beverly MA

International Classification:

G01N 27/414

US Classification:

204416, 204412, 257253

Abstract:

A multimode electrochemical sensing array formed on an integrated circuit chip is structured to provide electrochemical determination of acidity or alkalinity, as well as electrochemical and potentiometric measurement of oxidation/reduction potentials, conductivity measurements, electrostatic discharge protection, and ground provisioning.

US Patent:

8021529, Sep 20, 2011

Filed:

Jul 20, 2005

Appl. No.:

11/185545

Inventors:

Steven J. West - Hull MA, US
Armin Kusig - Wayland MA, US
Stephen Olsted - Rowley MA, US
Jonathan Lowe - Scotland, GB
Xiaowen Wen - Lexington MA, US

Assignee:

Thermo Orion, Inc. - Beverly MA

International Classification:

G01N 27/27

US Classification:

204409, 204400, 204407, 324438, 324450

Abstract:

A measurement/calibration cell for potentiometrically measuring ion concentration in a fluid interposes a barrier between measuring and reference electrodes and positions the measuring electrode at a sufficiently higher gravimetric potential above the reference electrode that seepage of electrolyte from the latter to the former is effectively precluded. A controller associated with the cell displays instructions and other desired information on a scrolling display such that a substantial amount of information can be presented in a relatively small display window.

US Patent:

8603307, Dec 10, 2013

Filed:

May 27, 2008

Appl. No.:

12/127534

Inventors:

Steven J. West - Hull MA, US
Timothy C. Gillette - Brookline MA, US

Assignee:

Thermo Fisher Scientific, Inc. - Beverly MA

International Classification:

G01N 27/333
G01N 27/36

US Classification:

204401, 204406, 204416

Abstract:

A system for monitoring the viability of an electrochemical cell measures the impedance of the cell over a wide range of impedances and with diminished phase shift over prior methods so that a more nearly accurate assessment of the impedance can be made. The system is particularly useful for four electrode systems, but is not so limited. It may advantageously be incorporated in the cell itself to further minimize cabling artifacts.

US Patent:

20030024812, Feb 6, 2003

Filed:

Feb 28, 2001

Appl. No.:

09/796103

Inventors:

Steven West - Hull MA, US

International Classification:

G01N027/414

US Classification:

204/416000, 204/435000

Abstract:

Disclosed is an electrochemical cell containing two or more electrodes wherein the half-cell potential of at least one electrode is determined by the concentration of a specific ion anticipated to be present in all test solutions, said ion concentration being measured in the cell by a first electroanalytical technique that does not depend on a known reference electrode potential, such that said electrode, its half-cell potential being calculable from the measured ion concentration, can then serve as a reference electrode in one or more subsequent electroanalytical techniques that do depend on a known reference electrode potential, said subsequent technique or techniques being carried out in the same cell.

US Patent:

20090211924, Aug 27, 2009

Filed:

Jan 28, 2009

Appl. No.:

12/361385

Inventors:

Steven J. West - Hull MA, US
Zhisheng Sun - Hopkinton MA, US

International Classification:

G01F 1/64

US Classification:

2057875, 204433

Abstract:

A pH half-cell method and apparatus includes an electrode, a pH sensitive glass membrane and an electrolyte in electrolytic contact with the electrode and membrane. The membrane includes at least about 15 mole percent lithium, and the electrolyte includes a lithium salt as the predominant monovalent cation. The pH half-cell is used with a reference half-cell and meter to provide an electrochemical potential measurement sensor, optionally with both half-cells disposed within a single housing. The lithium salt electrolyte is also used in a method for storing, conditioning, preserving and/or rehabilitating a pH half-cell.