Celeste L Hort

US Patent:

6911180, Jun 28, 2005

Filed:

Oct 22, 2003

Appl. No.:

10/691003

Inventors:

James B. Miller - Pittsburgh PA, US
Celeste Hort - Cranberry Township PA, US
Towner B. Scheffler - Butler PA, US

Assignee:

Mine Safety Appliances Company - Pittsburgh PA

International Classification:

G01N031/12
G01N027/00
G01N027/16
G01N009/00
G01N019/10

US Classification:

422 94, 422 83, 422 88, 422 95, 422 96, 422 97, 422 98, 73 101, 73 102, 73 232, 436149, 436156, 436155, 436159

Abstract:

A combustible gas sensor includes an active element in electrical connection with a measurement circuit. The measurement circuit includes a thermistor network to compensate for the effect of changes in ambient temperature to the resistance of the active element. Another combustible gas sensor includes an active element having a geometric surface area no greater than approximately 0. 5 mmin electrical connection with a measurement circuit. The measurement circuit includes a compensator that compensates for the effect of changes in ambient temperature to the resistance of the active element without compensating for heat lost by thermal conduction from the active element. A method of sensing gas including the steps of: (i) providing a catalytic active element having a geometric surface area sufficiently small such that the effect upon the output of the active element of heat lost from the active element by thermal conduction is relatively small, and (ii) compensating for only the effect of changes in ambient temperature upon the output of the active element.

US Patent:

7284470, Oct 23, 2007

Filed:

Jul 22, 2005

Appl. No.:

11/187134

Inventors:

Christopher A. Huber - Butler PA, US
Celeste L. Hort - Butler PA, US
Francois Gamache - St. Lambert de Lauzon, CA

Assignee:

Mine Safety Appliances Company - Pittsburgh PA

International Classification:

F41H 5/04
F41H 5/08
F41H 1/02

US Classification:

89 3602, 89 3605, 2 25

Abstract:

A projectile resistant device for use in armor includes a ceramic component; and at least a first component adhered to the ceramic component on at least one side thereof. Preferably the first component is a woven carbon fabric that is adhered to the back surface of the ceramic component. The projectile resistant device can further include at least a second component adhered to the front surface of the ceramic component. The second component preferably comprises a woven carbon fabric. The projectile resistant device can also include a retention layer adhered to the front surface of the second component. At least a portion of the retention layer extends around the edges of the second component, the ceramic component, and the first component and is adhered to the back surface of the first component. Preferably the retention layer is a woven fiberglass.

US Patent:

6663834, Dec 16, 2003

Filed:

Oct 27, 2000

Appl. No.:

09/698740

Inventors:

James B. Miller - Pittsburgh PA
Celeste Hort - Cranberry Township PA
Towner B. Scheffler - Butler PA

Assignee:

Mine Safety Appliance Company - Pittsburgh PA

International Classification:

G01N 900

US Classification:

422 94, 422 83, 422 88, 422 95, 422 96, 422 97, 422 98, 73 101, 73 102, 73 232, 436149

Abstract:

A combustible gas sensor includes an active element in electrical connection with a measurement circuit. The measurement circuit includes a thermistor network to compensate for the effect of changes in ambient temperature to the resistance of the active element. Another combustible gas sensor includes an active element having a geometric surface area no greater than approximately 0. 5 mm in electrical connection with a measurement circuit. The measurement circuit includes a compensator that compensates for the effect of changes in ambient temperature to the resistance of the active element without compensating for heat lost by thermal conduction from the active element. A method of sensing gas including the steps of: (i) providing a catalytic active element having a geometric surface area sufficiently small such that the effect upon the output of the active element of heat lost from the active element by thermal conduction is relatively small, and (ii) compensating for only the effect of changes in ambient temperature upon the output of the active element.