Eric James Hanson

US Patent:

8196454, Jun 12, 2012

Filed:

Dec 11, 2009

Appl. No.:

12/654173

Inventors:

Eric Hanson - Ruxton MD, US
Colin Gordon Hodge - Ellicott City MD, US
Gilbert Olvera - New Windsor MD, US

Assignee:

Hamilton Associates, Inc. - Owings Mill MD

International Classification:

G01M 3/02
G01M 3/20

US Classification:

73 407, 73 40, 12820222, 12820621

Abstract:

An apparatus for testing a protective mask. The apparatus includes a testing unit for testing a protective mask. The testing unit includes a headform upon which a protective mask to be tested is mounted. The testing unit is configured to take a sample of the challenge from two different locations about the protective mask. The testing unit may also be configured to inflate and deflate a neck seal protective mask when mounted on the headform prior to performing a mask leakage test to eliminate or significantly reduce pockets or folds that may hide a leak.

US Patent:

8453495, Jun 4, 2013

Filed:

Sep 29, 2010

Appl. No.:

12/923583

Inventors:

Eric Hanson - Ruxton MD, US
Colin Gordon Hodge - Ellicott City MD, US
Gary Warren McCurdy - Eldersburg MD, US
Gilbert Olvera - New Windsor MD, US

Assignee:

Hamilton Associates, Inc. - Owings Mills MD

International Classification:

G01M 3/04

US Classification:

73 40

Abstract:

A test head assembly for supporting at least a portion of a protective mask to be tested for leaks. Preferably, the test head assembly includes a test head having a test space that is generally coextensive with an inner surface of the protective mask being tested. Although the test space is generally coextensive with the inner surface of the protective mask being tested, it is designed such that it has minimal volume to enhance the testing process by expediting test response time, reducing the time period it takes for a mask tester to reach one or more prerequisite test conditions, eliminate or greatly reduce lag time when the mask tester is operating in the probe mode and prevent dilution of challenge concentration. Preferably, the test head is formed from two or more removable sections to allow the size of the test head to be readily modified.

US Patent:

45131228, Apr 23, 1985

Filed:

Mar 18, 1983

Appl. No.:

6/476807

Inventors:

Eric A. Hanson - Columbia MD
Felek Jachimowicz - Columbia MD

Assignee:

W. R. Grace & Co. - New York NY

International Classification:

C08F 832

US Classification:

5253323

Abstract:

The present invention is directed to cross-linked, cationic polymers having a mixture of secondary and/or tertiary alkylene amine groups and alkylene quaternary ammonium groups pendant from a substantially completely saturated hydrocarbon polymer chain and to the use of said polymers as retention and drainage aids in paper making processes.