The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 27, 2011
Filed:
Jun. 26, 2003
Christopher L. Prete, Cranberry Township, PA (US);
John F. Rihn, Glenshaw, PA (US);
Christopher L. Prete, Cranberry Township, PA (US);
John F. Rihn, Glenshaw, PA (US);
Mine Safety Appliances Company, Cranberry Township, PA (US);
Abstract
A pressure demand regulator assembly for use with a breathing apparatus having a valve assembly that includes an inlet for connection to a source of breathing gas, an outlet for connection to a facepiece to provide breathing gas to the user and an actuator for controlling the flow of breathing gas between the inlet and the outlet in response to the user's respiration. The regulator assembly further includes a flexible elastomeric diaphragm in operative connection with the actuator. The diaphragm is exposed to ambient pressure on a first side thereof and exposed to a positive pressure within the facepiece on a second side thereof. The regulator assembly also includes an impermeable and flexible shield that seals the first side of the diaphragm from certain toxic substances in the ambient atmosphere while allowing the first side of the diaphragm to experience ambient pressure, such that the flexible shield moves along with the diaphragm during respiration without dampening the movement of the diaphragm during respiration of the user.