Patent US4698107A successfully refreshed from Google Patents.
US4698107A
Expired / Lapsed
US
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Gas generating material
Assignee: ZF Passive Safety Systems US Inc
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Filing: 1986-12-24
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Granted: 1987-10-06
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Expires: 2006-12-24
Abstract
Abstract Structure for generating nitrogen gas for inflating an air bag vehicle occupant restraint 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 20 to 50% by weight of an alkali metal azide, 25 to 35% by weight of an inorganic oxidizer, 10 to 15% by weight of a fluoroelastomer binder, 15 to 25% by weight of magnesium, and 1 to 3% by weight of fumed silicon dioxide. The coating may also include 1 to 6% by weight of graphite 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 08:46
CPC Classifications
B; B60; B60R; B60R21/00; B60R21/02; B60R21/16; B60R21/26; B60R21/264; B60R21/2644; C; C06; C06B; C06B45/00; C06B45/12; C06B45/14; C06B45/16; C06D; C06D5/00; C06D5/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 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; 20 to 50% by weight of an alkali metal azide, 25 to 35% by weight of an inorganic oxidizer, 10 to 15% by weight of a fluoroelastomer binder, 15 to 25% by weight of magnesium, and 1 to 3% by weight of fumed silicon dioxide.
Claim 2
Dependent Claim
74 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; 20 to 50% by weight of an alkali metal azide, 25 to 35% by weight of an inorganic oxidizer, 10 to 15% by weight of a fluoroelastomer binder, 15 to 25% by weight of magnesium, and 1 to 3% by weight of fumed silicon dioxide.
Claim 3
Dependent Claim
21 words
The structure defined in claim 1 wherein said alkali metal azide is sodium azide and said inorganic oxidizer is sodium nitrate.
Claim 4
Dependent Claim
14 words
The structure defined in claim 1 further including 1-6% by weight of graphite fiber.
Claim 5
Dependent Claim
46 words
The structure defined in claim 1 wherein said coating comprises; about 43% by weight of sodium azide, about 28% by weight of sodium nitrate, about 2% by weight of fumed silicon dioxide, about 10% by weight of a fluoroelastomer, and about 16% by weight of magnesium.
Claim 6
Dependent Claim
25 words
The structure defined in claim 1 wherein said coating weight comprises from about 1 to about 4 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
42 words
The structure as defined in claim 6 wherein said material further includes: 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 silica.
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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) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |