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:
Apr. 06, 1982
Filed:
Mar. 11, 1980
Donald R Gneiding, Fullerton, CA (US);
Robertshaw Controls Company, Richmond, VA (US);
Abstract
Pressure responsive flow control apparatus for connection between a source of emergency breathing gas and a hood adapted to fit about a wearer's head for receiving the breathing gas at a controlled flow for inhalation and for receiving the exhalations of the wearer. The flow control apparatus includes a pressure regulating valve operative to maintain a substantially constant discharge pressure to the hood despite progressively decreasing source pressure. Further included is a flow control valve operative against a bias force, and responsive to source pressure, to control gas flow to the hood, the bias force being effective to move the flow control valve such that the rate of gas flow increases with diminishing source pressure thereby to compensate for increased concentration of carbon dioxide in the hood resulting from cumulative exhalations of the wearer.