Mark John Fraser

US Patent:

8137446, Mar 20, 2012

Filed:

Mar 12, 2008

Appl. No.:

12/047052

Inventors:

Thomas D. Plamondon - Haverhill MA, US
Nikolay Rolshud - Winchester MA, US
Peter F. Cram - Merrimack NH, US
Mark Fraser - Nashua NH, US

Assignee:

L-3 Communications Security and Detection Systems, Inc. - Woburn MA

International Classification:

B01D 45/00
B01D 45/02

US Classification:

96413, 7386322, 55397, 55398, 55442, 55446

Abstract:

Concentrating particles in a turbulent gas flow may include receiving, in a receptacle, a turbulent gas flow that includes particles. The concentration of particles in a gas flow exiting the receptacle at a first port is increased as compared with a concentration of the particles in the gas flow received by the receptacle. The increased concentration of particles is accomplished by removing a portion of the gas flow by using a second port, and fluidly communicating the gas flow through a tube in the receptacle. The tube has a smaller diameter at the end of the tube at which the gas flow exits the tube than diameter at the end of the tube at which the gas flow is received.

US Patent:

8252088, Aug 28, 2012

Filed:

Sep 19, 2011

Appl. No.:

13/236047

Inventors:

Thomas D. Plamondon - Haverhill MA, US
Nikolay Rolshud - Winchester MA, US
Peter F. Cram - Merrimack NH, US
Mark Fraser - Nashua NH, US

Assignee:

L-3 Communications Security and Detection Systems, Inc. - Woburn MA

International Classification:

B01D 45/00
B01D 45/02

US Classification:

95 32, 95267, 96413, 7386322, 55397, 55398, 55442, 55446

Abstract:

Concentrating particles in a turbulent gas flow may include receiving, in a receptacle, a turbulent gas flow that includes particles. The concentration of particles in a gas flow exiting the receptacle at a first port is increased as compared with a concentration of the particles in the gas flow received by the receptacle. The increased concentration of particles is accomplished by removing a portion of the gas flow by using a second port, and fluidly communicating the gas flow through a tube in the receptacle. The tube has a smaller diameter at the end of the tube at which the gas flow exits the tube than diameter at the end of the tube at which the gas flow is received.

US Patent:

20110151575, Jun 23, 2011

Filed:

Dec 21, 2007

Appl. No.:

11/963670

Inventors:

Mark Fraser - Nashua NH, US
Ravi K. Konduri - Heathrow FL, US

Assignee:

L-3 COMMUNICATIONS CYTERRA CORPORATION - Orlando FL

International Classification:

G01N 21/72
G01J 1/00
H01J 40/00
G01J 5/00
G01J 1/42

US Classification:

436155, 2503361, 250200, 2503381, 2502082

Abstract:

Energy released from energized particles is sensed. Whether the energized particles include a possible energetic material is determined based on the sensed energy. If a determination is made that the energized materials include a possible energetic material, a spectral signature of the sensed energy is determined. The spectral signature of the sensed energy is compared to one or more known spectral signatures associated with energetic materials. Whether the possible energetic material is an actual energetic material is determined based on the comparison.

US Patent:

55650732, Oct 15, 1996

Filed:

Jun 5, 1995

Appl. No.:

8/463752

Inventors:

Mark E. Fraser - Andover MA
Alan S. Woodman - Andover MA
Everett B. Anderson - Andover MA
E. Jennings Taylor - Andover MA

International Classification:

C25B 900

US Classification:

204256

Abstract:

In the disclosed electrochemical cell for the production of an alkaline solution of peroxide, especially on-site production, the electrolyte is divided into an aqueous alkaline catholyte and an aqueous alkaline anolyte, and the cathode is a gas-diffusion electrode. The active material of the electrolyte side of the gas-diffusion cathode comprises a particulate catalyst support material having a surface area of about 50 to about 2000 m. sup. 2 /g, and, deposited on the particles of this support material, 0. 1 to 50 weight-%, based on the weight of the active layer, of gold or gold alloy poly-crystal particles having an average size. gtoreq. 5 but less than about 20 nanometers. These poly-crystal gold or gold alloy particles have a structure consisting essentially of combined individual monocrystals and are substantially selectively catalytic for the reduction of oxygen to peroxide ion or hydrogen peroxide (e. g. HOO. sup. theta. ). The electrolyte flow patterns are designed to avoid loss of peroxide resulting from oxidation at the anode. In the operation of the cell, a product with a hydroxyl:perhydroxyl ratio less than 2:1 can be obtained.

US Patent:

60347686, Mar 7, 2000

Filed:

Jul 13, 1998

Appl. No.:

9/114147

Inventors:

Mark E. Fraser - Nashua NH
Karl Holtzclaw - Richardson TX
Amy Hunter - Andover MA
Steven J. Davis - Londonderry NH
Lawrence G. Piper - Reading MA

Assignee:

Physical Sciences Inc. - Andover MA

International Classification:

G01N 2163
G01J 330

US Classification:

356316

Abstract:

The invention relates to high power, spark induced breakdown spectroscopy (SIBS) detectors with controllable delay time and to spark induced breakdown spectroscopy plasma generators with dual electrodes with specific electrode material, both for use in methods and apparatuses for detecting spectral signatures of atomic emissions, (e. g. , from heavy metals such as lead, mercury, chromium, cadmium, arsenic, antimony and beryllium and radioactive materials such as uranium, plutonium, thorium and technetium) for measuring, for example, atomic concentrations of samples such as vapors and airborne particulates.

US Patent:

56479689, Jul 15, 1997

Filed:

Apr 17, 1996

Appl. No.:

8/633563

Inventors:

Mark E. Fraser - Nashua NH
Alan S. Woodman - Epping NH
Everett B. Anderson - Reading MA
E. Jennings Taylor - Troy OH

Assignee:

PSI Technology Co. - Andover MA

International Classification:

C25B 130

US Classification:

205466

Abstract:

In the disclosed electrochemical cell for the production of an alkaline solution of peroxide, especially on-site production, the electrolyte is divided into an aqueous alkaline catholyte and an aqueous alkaline anolyte, and the cathode is a gas-diffusion electrode. The active material of the electrolyte side of the gas-diffusion cathode comprises a particulate catalyst support material having a surface area of about 50 to about 2000 m. sup. 2 /g, and, deposited on the particles of this support material, 0. 1 to 50 weight-%, based on the weight of the active layer, of gold or gold alloy particles having an average size >40 but less than about 200. ANG. These gold or gold alloy particles are substantially selectively catalytic for the reduction of oxygen to peroxide (e. g. HOO. sup. crclbar. ). The electrolyte flow patterns are designed to avoid loss of peroxide resulting from oxidation at the anode. In the operation of the cell, a product with a hydroxyl:perhydroxyl ratio less than 2:1 can be obtained.

US Patent:

56956223, Dec 9, 1997

Filed:

Nov 21, 1996

Appl. No.:

8/754003

Inventors:

Mark E. Fraser - Nashua NH
Alan S. Woodman - Epping NH
Everett B. Anderson - Reading MA
E. Jennings Taylor - Troy OH

Assignee:

PSI Tecnology Co. - Andover MA

International Classification:

C25B 1104

US Classification:

204292

Abstract:

In the disclosed electrochemical cell for the production of an alkaline solution of peroxide, especially on-site production, the electrolyte is divided into an aqueous alkaline catholyte and an aqueous alkaline anolyte, and the cathode is a gas-diffusion electrode. The active material of the electrolyte side of the gas-diffusion cathode comprises a particulate catalyst support material having a surface area of about 50 to about 2000 m. sup. 2 /g, and, deposited on the particles of this support material, 0. 1 to 50 weight-%, based on the weight of the active layer, of gold or gold alloy particles having an average size >40 but less than about 200. ANG. These gold or gold alloy particles are substantially selectively catalytic for the reduction of oxygen to peroxide (e. g. HOO. sup. crclbar. ). The electrolyte flow patterns are designed to avoid loss of peroxide resulting from oxidation at the anode. In the operation of the cell, a product with a hydroxyl:perhydroxyl ratio lees than 2:1 can be obtained.