Daryl L Roberts

US Patent:

6453758, Sep 24, 2002

Filed:

May 5, 2000

Appl. No.:

09/567552

Inventors:

Virgil A. Marple - Maple Plain MN
Daryl L. Roberts - Blaine MN
Benjamin Y. H. Liu - North Oaks MN

Assignee:

MSP Corporation - Minneapolis MN

International Classification:

G01N 100

US Classification:

7386322, 55318, 55319, 209133

Abstract:

A compact cascade impactor is formed to classify particles carried in a flow through the impactor. The impactor has collection chambers that are arranged to conserve space and yet provide a large flow passageway. The collection chamber may be tear drop shaped and being nested together. The impactor includes nozzles that are used across a desired flow range without changing the nozzles.

US Patent:

6520673, Feb 18, 2003

Filed:

Dec 8, 2000

Appl. No.:

09/733108

Inventors:

Virgil A. Marple - Maple Plain MN
Daryl L. Roberts - Blaine MN

Assignee:

MSP Corporation - Minneapolis MN

International Classification:

B01F 900

US Classification:

366213, 366217

Abstract:

A mixer supports a cradle holding an inlet component for a cascade impactor, and has sealing caps to close open ends of the component to trap a solvent in the component. The cradle is rotated by a motor for dissolving particles in the inlet component.

US Patent:

6543301, Apr 8, 2003

Filed:

Dec 8, 2000

Appl. No.:

09/733113

Inventors:

Virgil A. Marple - Maple Plain MN
Daryl L. Roberts - Blaine MN

Assignee:

MSP Corporation - Minneapolis MN

International Classification:

G01N 124

US Classification:

7386323

Abstract:

A orifice plate used in an impactor that has a large number of very small openings therein is made of a thin material, and has a plurality of projections that extend outwardly from one surface thereof. The orifice plate is mounted adjacent a plate surface, and the projections serve to support the orifice plate spaced from the surface when the orifice plate deflects under differential pressures.

US Patent:

6561045, May 13, 2003

Filed:

Apr 24, 2001

Appl. No.:

09/841538

Inventors:

Benjamin Y. H. Liu - North Oaks MN
Daryl L. Roberts - Blaine MN
Virgil A. Marple - Maple Plain MN
Francisco J. Romay - Vadnais Heights MN

Assignee:

MSP Corporation - Minneapolis MN

International Classification:

G01N 100

US Classification:

7386321

Abstract:

A sampler for removing a sample of gas from a flue or stack utilizes virtual impactor principles, together with a gas jet ejector to insure that the surfaces are kept free of particles. The gas that is, discharged from the sampler thus is not changed in character by contact with particles that may adhere to surfaces of the sampler.

US Patent:

6595368, Jul 22, 2003

Filed:

Dec 8, 2000

Appl. No.:

09/733111

Inventors:

Daryl L. Roberts - Blaine MN
Virgil A. Marple - Maple Plain MN

Assignee:

MSP Corporation - Shoreview MN

International Classification:

B07B 704

US Classification:

2091391, 209 23, 209143

Abstract:

A pre-separator for separating out large particles from a fluid flow has a housing forming an interior chamber with an inlet and an outlet, and a separator plate in the chamber between the inlet and outlet. The separator plate has a surface facing the inlet that is provided with a liquid carrying tank into which the flow is directed when it enters the interior chamber through the inlet. The separator plate has a series of nozzle openings therethrough adjacent its periphery to the outside of the tank. The nozzle openings adjacent the periphery of the separator plate overlie a surface of the housing adjacent the outlet. The pre-separator thus has two impaction stages that permit use across a wide range of flows. The separator plate and the housing have surfaces which are tapered so that liquid in the housing can be drained out when the housing is inverted.

US Patent:

6647758, Nov 18, 2003

Filed:

Dec 8, 2000

Appl. No.:

09/733106

Inventors:

Virgil A. Marple - Maple Plaine MN
Daryl L. Roberts - Blaine MN

Assignee:

MSP Corporation - Minneapolis MN

International Classification:

G01N 112

US Classification:

73 2803, 7386322, 73 2805, 73 106, 73 37

Abstract:

An impactor assembly comprises a base for supporting a plurality of cups that form impactor plates, and a nozzle above each of the cups through which a flow passes for classification. The cover is removable, and a test cover can be put into position for mounting in place and providing outlets connectable to pressure sensor for determining pressure drop across the nozzle plates at each impactor stage. The cover also is designed to be easily washed by having no blind cavities or moving parts on the cover, and the latch and other hinge assemblies are all supported on the base. The flow enters and exits the impactor without having external connections on the cover.

US Patent:

6723568, Apr 20, 2004

Filed:

Oct 5, 2000

Appl. No.:

09/679936

Inventors:

Benjamin Y. H. Liu - North Oaks MN
Virgil A. Marple - Maple Plain MN
Daryl L. Roberts - Blaine MN

Assignee:

MSP Corporation - Shoreview MN

International Classification:

G01N 100

US Classification:

436174, 7386322, 55318, 55319, 209133

Abstract:

A compact cascade impactor is formed to classify particles carried in a flow through the impactor. The impactor has collection chambers that are arranged to conserve space and yet provide a large flow passageway. The collection chamber may be tear drop shaped and being nested together. The impactor includes nozzles that are used across a desired range without.

US Patent:

7325441, Feb 5, 2008

Filed:

Sep 9, 2005

Appl. No.:

11/223440

Inventors:

Benjamin Y. H. Liu - North Oaks MN, US
Daryl L. Roberts - Blaine MN, US

Assignee:

MSP Corporation - Shoreview MN

International Classification:

G01M 3/04

US Classification:

73 40

Abstract:

A personal mask testing system (PMTS) is of a size of a human hand. The PMTS has several energy efficient features that permit running the PMTS from a battery source within the housing. The PMTS also includes a replaceable vapor source.