Title: Multi-user extended operation respirator

Abstract: A respiratory protective device is disclosed. The device is of a type which may be used by several persons for an extended length of time in a noxious environment. The invention is characterized by a source of oxygen-rich gas, a breathing bag means, a valving system to vent and replenish the breathing bag means, a breathing conduit loop having inhalation and exhalation manifolds and a means therebetween to deliver breathable gas to several users at the same time, and a scrubber to remove carbon dioxide from exhaled gas. Special features include a unique dual alternately active breathing bag means and an assist means for movement of exhaled gas through the scrubber.

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Inventors: Jansson, David Guild (Natick, MA, US)

Application Number: 492719
Filing Date: 1974-07-29
Publication_date: 1976-08-10
Assignee:
Primary Class(es): 128/205.12 128/205.13
Other Classes:
US Patent Ref:

1370590	Mar, 1921	Kamieniecki	128/142.
2332662	Oct, 1943	Nathanson	128/142.
3016053	Jan, 1962	Medovick	128/142.
3219034	Nov, 1965	Kalenik	128/142.
3575167	Apr, 1971	Michielsen	128/142.
3577988	May, 1971	Jones	128/191.
3722510	Mar, 1973	Parker	128/142.
3805590	Apr, 1974	Ringwall et al.	128/142.
3815592	Jun, 1974	Stau, Jr.	128/191.

Other Refs: 216,459

May, 1924	UK

Primary Examiner: Michell, Robert W.
Assistant Examiner: Recla, Henry J.
Attorney: