Patent US4526734A successfully refreshed from Google Patents.
Patent JPS5295880A successfully refreshed from Google Patents.
US4064875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-suffocation means for aircraft breathing mask
Assignee: Northrop Grumman Guidance and Electronics Co Inc
•
Filing: 1976-07-02
•
Granted: 1977-12-27
•
Expires: 1996-07-02
Abstract
Abstract An emergency breathing system has an anti-suffocation valve located in a housing between a source of breathable fluid and a distribution mask. The housing has a chamber which is connected to the distribution mask and an opening which connects the chamber with the surrounding environment. The anti-suffocation valve responds to an inhalation demand of a recipient to allow air from the surrounding environment to enter the chamber and satisfy the inhalation demand of a recipient to allow air from the surrounding environment to enter the chamber and satisfy the inhalation demand. A hydrophobic filter surrounds the opening and prevents the entry of any water present in the surrounding environment into the chamber which could inhibit cyclic inhalation of breathable fluid by the recipient.
Inventors
- 👤 Robert L. Cramer
- 👤 Jack E. Dunbar
- 👤 James A. Mientus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:37
CPC Classifications
A; A62; A62B; A62B9/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
185 words
Anti-suffocation means for allowing the communication of air from a surrounding environment into a breathing system in an emergency condition when a source of breathable fluid is insufficient to meet an inhalation demand of a recipient, said anti-suffocation means comprising: a housing having a bore therein adapted to be connected to said breathing system, said housing having an opening connecting said bore to the surrounding environment; valve means responsive to said inhalation demand for allowing communication of air through said opening; filter means connected to said opening, said filter having a microporous membrane means for forming a barrier through which the transmission of water is inhibited to prevent contamination of the breathing system by any water present in the surrounding environment during the operation of said valve means by said inhalation demand; clip means attached to said housing for sealing said opening from the surrounding environment prior to said emergency condition; and means for removing said clip means from the housing when an emergency condition occurs to allow said anti-suffocation means to operate should the recipient present a predetermined inhalation demand on said breathing system.
Claim 2
Dependent Claim
185 words
Anti-suffocation means for allowing the communication of air from a surrounding environment into a breathing system in an emergency condition when a source of breathable fluid is insufficient to meet an inhalation demand of a recipient, said anti-suffocation means comprising: a housing having a bore therein adapted to be connected to said breathing system, said housing having an opening connecting said bore to the surrounding environment; valve means responsive to said inhalation demand for allowing communication of air through said opening; filter means connected to said opening, said filter having a microporous membrane means for forming a barrier through which the transmission of water is inhibited to prevent contamination of the breathing system by any water present in the surrounding environment during the operation of said valve means by said inhalation demand; clip means attached to said housing for sealing said opening from the surrounding environment prior to said emergency condition; and means for removing said clip means from the housing when an emergency condition occurs to allow said anti-suffocation means to operate should the recipient present a predetermined inhalation demand on said breathing system.
Claim 3
Dependent Claim
69 words
The anti-suffocation means, as recited in claim 1, wherein said clip removal means includes: a lanyard means having one end attached to said clip means and an opposite end adapted to be attached to an aircraft for retaining said clip means in the aircraft to allow said valve means to immediately respond to inhalation demands should the recipient be required to agress from an aircraft in a bailout situation.
Claim 4
Dependent Claim
40 words
The anti-suffocation means as recited in claim 2 further including: means for protecting said valve means from any direct wind forces to prevent the operation of said valve means by an outside wind force during descent in the bailout situation.
Claim 5
Dependent Claim
55 words
The anti-suffocation means, as recited in claim 1, wherein said valve means includes: seat means secured to said housing; poppet means located in said chamber; and resilient means for biasing said poppet means into contact with said seat means to prevent communication of breathable fluid from said chamber through said opening into the surrounding environment.
Claim 6
Dependent Claim
30 words
The anti-suffocation means, as recited in claim 2, wherein said valve means further includes: guide means secured to said housing for maintaining said poppet means in alignment with said seat.
Claim 7
Dependent Claim
28 words
The anti-suffocation means, as recited in claim 1, wherein said membrane includes: a layer of microporous film having an average pore size of between 0.20 to 0.80 microns.
Claim 8
Dependent Claim
43 words
The anti-suffocation means, as recited in claim 1, further including: indicator means for warning a recipient of improper installation of said clip means which could allow air from the surrounding environment to enter the breathing system in response to a momentary inhalation demand.
References Cited (Backward Citations)
GB356547A
Cited
US3129707A
Cited
US3189027A
Cited
DE1431331A1
Cited
US3577988A
Cited
US3768466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |