# US 2014/0150780 A1 · Protective breathing apparatus inhalation duct

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- Number: US 2014/0150780 A1
- Document ID: US20140150780A1
- Status: Published application
- Kind: A1
- Application number: 14/089,587
- Filed: 2013-11-25
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: B/E Aerospace, Inc.
- Applicants: B/E Aerospace, Inc.
- Inventors: Timothy Steger; Kevin Bennett; Stephen Eastman
- Web page: https://patentgrep.com/patent/US20140150780A1

## CPC

- A62B 7/08: containing chemicals producing oxygen
- A62B 18/04: Gas helmets
- A62B 18/045: {with fans for delivering air for breathing mounted in or on the helmet}
- A62B 25/005: {for high altitude}
- A62B 7/14: for high-altitude aircraft
- A62B 17/04: Hoods
- A62B 18/10: Valves
- A62B: DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING (valves specially adapted for medical use A61M39/00; life-saving devices, apparatus or methods specially adapted for use in water B63C9/00; divers' equipment B63C11/00; specially adopted for use with aircraft, e.g. parachutes, ejector seats, {B64D17/00, B64D25/10}; rescue devices peculiar to mining E21F11/00)

## Abstract

An improved protective breathing apparatus having a vent hole or one way valve incorporated into the inhalation duct so that the breathing apparatus can safely vent and release a pressure differential during the opening of the storage bag from vacuum storage. The use of an air pressure relief mechanism prevents the rupture of the duct and preserves the integrity of the device.

## Claims

### Claim 1

A self-contained, closed circuit breathing apparatus, comprising:
an inhalation duct;
an exhalation duct;
a source of breathable gas under vacuum; and
a hole in the inhalation duct at an interface with the inhalation duct and the source of breathable gas under vacuum for preventing deformation of the inhalation duct in a transition between vacuum and ambient.

### Claim 2 (depends on 1)

The self-contained, closed circuit breathing apparatus in claim 1 wherein said source of breathable gas comprises a canister containing KO2 (potassium superoxide) and a starter candle that activates breathable gas production using NaClO3.

### Claim 3 (depends on 1)

The self-contained, closed circuit breathing apparatus in claim 1 wherein said hole is covered by a flap that permits one-way flow of a gas into the inhalation duct.

### Claim 4 (depends on 1)

The self-contained, closed circuit breathing apparatus in claim 1 wherein said hole is a one way valve that permits one-way flow of a gas into the inhalation duct.