Breathing equipment for high altitude flights
Patent 4172455 Issued on October 30, 1979. Estimated Expiration Date: 
September 2, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 2, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2335474 2970593 3433222 3438060 3892234 3910269 InventorAssigneeApplicationNo. 05/830199 filed on 09/02/1977US Classes:128/201.23And nose and mouth also coveredExaminersPrimary: Recla, Henry J.Attorney, Agent or FirmInternational ClassesA62B 18/04 (20060101)A62B 18/00 (20060101) Foreign Application Priority Data1976-12-28 FRAbstractA breathing equipment for high altitude flights comprises a breathing mask provided with a breathing gas regulator capable of supplying breathing gas under pressure and a helmet. The helmet is provided with means which, if the pressure of the breathing gas supplied to the mask is higher than the ambient pressure by an amount exceeding a predetermined threshold, subject those organs of the head which are particularly sensitive to the pressure differential to a gas over-pressure sufficient to avoid physiological troubles. | |
