Kenneth L Ewing

US Patent:

6372509, Apr 16, 2002

Filed:

Mar 18, 1998

Appl. No.:

09/040331

Inventors:

John W. Foerster - Millersville MD
Kenneth Ewing - Crofton MD
Angela Ervin - Crofton MD
Robert Lamontagne - Bethesda MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01N 3320

US Classification:

436 80, 436 73, 436166, 436169

Abstract:

A method for determining copper (I) concentrations in water or seawater samples. In the method a probe is dipped into the sample for a time sufficient to produce a color change, removed and compared to a color standard to determine the concentration. The probe includes a substrate and an impregnate, bathocuproine, which complexes to copper (I) to produce a colored complex that is not toxic or less toxic to marine organisms than copper (I). The substrate is an ionomeric polymer having hydrophobic chains with hydrophilic cation exchange cites. In a preferred embodiment the substrate is a sulfonated perfluoropolymer.

US Patent:

8019466, Sep 13, 2011

Filed:

Jun 14, 2007

Appl. No.:

11/812076

Inventors:

Kenneth James Ewing - Crofton MD, US
Fred Whiton, Jr. - Towson MD, US
John Paul Santori - Ellicott City MD, US

Assignee:

Northrop Grumman Systems Corporation - Los Angeles CA

International Classification:

G06F 7/00

US Classification:

700225, 700230

Abstract:

A container screening system that uses multiple orthogonal sensors for detecting hazardous materials, such as liquid explosives and precursors of liquid explosives, in sealed containers. The container screening system comprises a first sensor that detects materials inside the container using a first detection technology, a second sensor that detects materials insider the container using a second detection technology, and a data processing unit that processes data from the first and second sensors and generates a screen result. The system reduces false positives and increases probability of detection by matching the relative strengths and weaknesses of each technology.

US Patent:

20110027905, Feb 3, 2011

Filed:

Aug 3, 2009

Appl. No.:

12/534568

Inventors:

Douglas B. Henderson - Columbia MD, US
Kenneth J. Ewing - Edgewater MD, US
Danielle N. Dickinson - Odenton MD, US

International Classification:

G01N 1/18
G01N 30/00
G01N 21/84

US Classification:

436178, 422 88, 422 63

Abstract:

Systems and methods are provided for collecting and analyzing analytes. One embodiment of the invention includes a system for collecting analyte. The system comprises a sampling section disposed on a collection platform and an air source that provides an analyte to be sorbed by the sampling section. The sampling section can be formed of a low pressure drop configuration of sorbent material

US Patent:

20110044855, Feb 24, 2011

Filed:

Nov 2, 2010

Appl. No.:

12/917749

Inventors:

Douglas B. HENDERSON - Columbia MD, US
Kenneth J. Ewing - Edgewater MD, US
Danielle N. Dickinson - Odenton MD, US

International Classification:

G01N 30/00

US Classification:

422 681, 422527

Abstract:

Systems and methods are provided for collecting and analyzing analytes. One embodiment of the invention includes a system for collecting analyte. The system comprises a sampling section disposed on a collection platform and an air source that provides an analyte to be sorbed by the sampling section. The sampling section can be formed of a low pressure drop configuration of sorbent material

US Patent:

20110053288, Mar 3, 2011

Filed:

Nov 2, 2010

Appl. No.:

12/917762

Inventors:

Douglas B. Henderson - Columbia MD, US
Kenneth J. Ewing - Edgewater MD, US
Danielle N. Dickinson - Odenton MD, US

International Classification:

G01N 1/18

US Classification:

436178

Abstract:

Systems and methods are provided for collecting and analyzing analytes. One embodiment of the invention includes a system for collecting analyte. The system comprises a sampling section disposed on a collection platform and an air source that provides an analyte to be sorbed by the sampling section. The sampling section can be formed of a low pressure drop configuration of sorbent material

US Patent:

20120120392, May 17, 2012

Filed:

Apr 18, 2007

Appl. No.:

11/785453

Inventors:

Kenneth James Ewing - Crofton MD, US
John Paul Santori - Ellicott City MD, US

International Classification:

G01J 3/44
G01J 5/02
G01J 3/30

US Classification:

356301, 356311, 2503381, 2503416

Abstract:

A chemical agent detection system is described. The system comprises a sample introduction module, an agent concentration module and a detection module. The sample introduction module comprises a sample collector that collects particles and aerosols from a sample, and a heater that vaporizes the collected particles and aerosols and produces a sample vapor. The agent concentration module comprises a sorbent tube filled with a sorbent material that preferentially absorbs the vapor of a target chemical agent when the sample vapor passes through the sorbent tube. The detection module interrogates the sorbent material and identifies the target chemical agent absorbed to the sorbent material. Also disclosed are methods for detecting a non-traditional agent (NTA) or a dusty agent (DA), and trace levels of chemical warfare agents (CWA) and toxic industrial chemical (TIC) vapors.

US Patent:

60914904, Jul 18, 2000

Filed:

Jul 30, 1998

Appl. No.:

9/126221

Inventors:

Christopher M. Stellman - Waldorf MD
Frank Bucholtz - Crofton MD
Kenneth J. Ewing - Crofton MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01N 2101
G01J 300

US Classification:

356300

Abstract:

The fiber-optic pipette (FOP) couples a glass capillary, common syringe and a single optical fiber together to provide for a facile means of achieving long-pathlength capillary spectroscopy. The FOP acquires rapid spectroscopic measurements of small-volume liquid samples, while simultaneously achieving signal enhancements of the collected spectroscopic signal.

US Patent:

56215223, Apr 15, 1997

Filed:

Apr 5, 1995

Appl. No.:

8/417164

Inventors:

Kenneth J. Ewing - Bowie MD
Thomas Bilodeau - Alexandria VA
Gregory Nau - Alexandria VA
Ishwar Aggarwal - Fairfax Station VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01J 344
G01N 2165

US Classification:

356301

Abstract:

The present invention is a chemical sensor including a polymer substrate capable of reversible adsorption of an analyte organic compound, a source of Raman excitation radiation, positioned for directing this Raman excitation radiation onto the substrate, thus generating a Raman signal, and a Raman signal detector, positioned for detecting this Raman signal. Another aspect of this invention is the sensing tip of such a sensor, including a polymer substrate capable of reversible adsorption of an analyte organic compound, focusing means for directing excitation radiation onto the polymer substrate to generate a Raman signal from the organic compound, and collection means, for transmitting this Raman signal to a detector. Another aspect of this invention is an array of sensing tips, each using a different polymer substrate selected for selective adsorption of an analyte species, coupled to an excitation radiation source and a detector.