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US3904221A Expired / Lapsed US ⏱️ 0.0 years remaining

Gas generating system for the inflation of a protective bag

Assignee: Asahi Kasei Corp
•
Filing: 1973-05-10
•
Granted: 1975-09-09
•
Expires: 1993-05-10
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Abstract

Abstract A light compact gas generating system is provided for the inflation of a protective bag to cushion a passenger (including a driver) from impact within a high speed vehicle such as an automobile the system can generate a low temperature, non-toxic and dustless gas with such a velocity as to inflate the bag in an extremely short time (in the order of 20-60 milliseconds). The system comprises a chamber surrounded by a wall composed at least in part of a layer comprising a plurality of metal wire gauzes which provide the passageway of the generated gas, a gas generating chemical composition enclosed in the chamber and at least one ignition tube enclosed in the chamber. The gas generating chemical composition consists essentially of at least one member selected from the group consisting of alkali metal azides, alkaline earth metal azides and hydroxy metal azides having the general formula M(OH)m(N3)n, wherein M represents a metal, said member being preferably strontium azide or barium azide. The composition generates non-toxic molecular nitrogen gas, which can be breathed by the passenger without ill effect.

Inventors

  • 👤 Takehiko Shiki
  • 👤 Tadamasa Harada
  • 👤 Ikuo Harada
  • 👤 Masaaki Shiga

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 20:59
CPC Classifications
B; B60; B60R; B60R21/00; B60R21/02; B60R21/16; B60R21/26; B60R21/264; B60R21/2644; F; F42; F42B; F42B3/00; F42B3/04; B60R21/263; B60R2021/2633; B60R2021/2648

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 189 words
A gas generating system for the inflation of a protective bag to cushion a passenger from impact with the structure of a high speed vehicle comprising (1) a chamber surrounded by a layer of metal wire gauzes wherein said layer hAs a heat capacity above 5 calories/*C per 1 mol of the generated nitrogen gas, having a ratio of total surface area of the wires to the total volume of the wires in the range of 150-400 cm 1, having a fractional void in the range of 60-90%, and having a thickness of 0.3-3 cm, (2) a gas generating chemical composition enclosed in the chamber, wherein said chemical composition is composed of (a) at least one metal azide selected from the group of alkali metal azides, alkali earth metal azides and hydroxy metal azides having the general formula M(OH)m(N3)n, wherein M represents Mg, Ca, Mn, Co and Ni, N represents nitrogen atoms, and m,n represent a positive number respectively where m plus n means atomic valency of M, and (b) at least one oxidizing agent, (3) at least one ignition tube for igniting said chemical composition in the chamber.
Claim 2
Dependent Claim 189 words
A gas generating system for the inflation of a protective bag to cushion a passenger from impact with the structure of a high speed vehicle comprising (1) a chamber surrounded by a layer of metal wire gauzes wherein said layer hAs a heat capacity above 5 calories/*C per 1 mol of the generated nitrogen gas, having a ratio of total surface area of the wires to the total volume of the wires in the range of 150-400 cm 1, having a fractional void in the range of 60-90%, and having a thickness of 0.3-3 cm, (2) a gas generating chemical composition enclosed in the chamber, wherein said chemical composition is composed of (a) at least one metal azide selected from the group of alkali metal azides, alkali earth metal azides and hydroxy metal azides having the general formula M(OH)m(N3)n, wherein M represents Mg, Ca, Mn, Co and Ni, N represents nitrogen atoms, and m,n represent a positive number respectively where m plus n means atomic valency of M, and (b) at least one oxidizing agent, (3) at least one ignition tube for igniting said chemical composition in the chamber.
Claim 3
Dependent Claim 24 words
A gas generating system according to claim 1, wherein said gas generating chemical composition further contains a reductive metal powder as a third component.
Claim 4
Dependent Claim 45 words
A gas generating system according to claim 1, wherein a part of the chamber wall which does not form the passageway of the generated gas is substantially covered with a thick sheet of silicon resin to prevent the passenger and the bag completely from burning.

References Cited (Backward Citations)

US3066014A Cited
US3527472A Cited
US3618976A Cited
US3663035A Cited
US3724870A Cited
US3690695A Cited
US3733180A Cited
US3666289A Cited
US3785674A Cited
US3741585A Cited
US3773351A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-09-08 1979-03-10 1979-09-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-09-08 1983-03-10 1983-09-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-09-08 1987-03-10 1987-09-09 $7700.00 Window Closed / Lapsed

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