US4806180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas generating material
Assignee: ZF Passive Safety Systems US Inc
•
Filing: 1988-05-12
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Granted: 1989-02-21
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Expires: 2008-05-12
Abstract
Abstract Structure for generating nitrogen gas for inflating an air bag vehicle occupant resistant comprises a grain made of an azide based material which generates gas upon combustion. The grain has an ignition enhancing coating thereon consisting essentially of 30 to 50% by weight of an alkali metal azide, 40 to 60% by weight of sodium nitrate or potassium perchlorate, 5 to 15% by weight of boron, and 1 to 15% by weight of sodium silicate. The coating may also include 1 to 6% by weight of graphite fibers as a roughening agent.
Inventors
- 👤 George W. Goetz
- 👤 Brian K. Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:50
CPC Classifications
C; C06; C06D; C06D5/00; C06B; C06B45/00; C06B45/12; C06B45/14; C06B45/16; C06B45/18; C06B45/30; C06D5/06; Y; Y10; Y10S; Y10S149/00; Y10S149/11
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
65 words
Structure for generating gas, said structure comprising: a grain made of an azide based material which generates gas upon combustion; said grain having an ignition enhancing coating thereon comprising; 30 to 50% by weight of an alkali metal azide, 40 to 60% by weight of an inorganic oxidizer, 5 to 15% by weight of boron, and 1 to 15% by weight of a metal silicate.
Claim 2
Dependent Claim
65 words
Structure for generating gas, said structure comprising: a grain made of an azide based material which generates gas upon combustion; said grain having an ignition enhancing coating thereon comprising; 30 to 50% by weight of an alkali metal azide, 40 to 60% by weight of an inorganic oxidizer, 5 to 15% by weight of boron, and 1 to 15% by weight of a metal silicate.
Claim 3
Dependent Claim
31 words
The structure defined in claim 1 wherein said alkali metal azide is sodium azide and said inorganic oxidizer is sodium nitrate or potassium perchlorate and said metal silicate is sodium silicate.
Claim 4
Dependent Claim
23 words
The structure defined in claim 2 wherein the sodium silicate is Na 2 O (SiO 2 ) n +where n=about 2 to 5.
Claim 5
Dependent Claim
22 words
The structure defined in claim 2 further including 1-6% by weight of graphite fibers or blends of graphite with a reinforcing fiber.
Claim 6
Dependent Claim
25 words
The structure defined in claim 1 wherein said coating weight comprises from about 2 to about 6 percent of the weight of the uncoated grain.
Claim 7
Dependent Claim
28 words
The structure as defined in claim 1 wherein said grain has opposite axial ends and passages which extend axially through the grain and intersect said opposite axial ends.
Claim 8
Dependent Claim
49 words
The structure as defined in claim 1 wherein said grain comprises a gas generating material which contains from about 2 to about 6% by weight of graphite fibers, said graphite fibers having a diameter of 3-15 microns and an average length of 40 to 125 thousandths of an inch.
Claim 9
Dependent Claim
44 words
The structure as defined in claim 6 wherein said azide based material comprises: 61-68% by weight of sodium azide, 0-5% by weight of sodium nitrate, 0-5% by weight of bentonite, 23-28% by weight of iron oxide, and 1-2% by weight of fumed metal oxide.
Claim 10
Dependent Claim
44 words
The structure as defined in claim 8 further comprising 2 to 6 percent by weight of graphite fibers or a blend of graphite with a reinforcing fiber and wherein said fumed metal oxide is selected from the group consisting of silica, alumina and titania.
Claim 11
Dependent Claim
15 words
The structure of claim 9 where the said reinforcing fiber is a potassium titanate fiber.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |