Patent US4533416A successfully refreshed from Google Patents.
US4533416A
Expired / Lapsed
US
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Pelletizable propellant
Assignee: Rockcor Inc
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Filing: 1981-08-07
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Granted: 1985-08-06
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Expires: 2001-08-07
Abstract
Abstract A pelletized propellant particularly suitable for crash restraint device inflation apparatus comprising an alkali metal azide, an oxidizing agent, and a metal oxide formed by dehydrating a hydrated oxide formed in situ, the burn time and sensitivity of the composition being adjusted to produce the necessary properties for crash restraint device inflators.
Inventors
- 👤 Donald R. Poole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:39
CPC Classifications
C; C06; C06D; C06D5/00; C06D5/06
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
150 words
A gas generating composition formable into pellets of enhanced strength made by the process comprising the steps of: forming a hydrated metal oxide gel by reacting a base with a metal salt, said metal being selected from the group consisting of aluminum, magnesium, chromium, manganese, iron, cobalt, copper, nickel, cerium and of the remaining transition series elements which form a gelatinous hydrated metal oxide when the salts thereof are reacted with a base; mixing said hydrated metal oxide gel with a metal oxide oxidant chosen from the group consisting of the oxides of aluminum, magnesium, chromium, manganese, iron, cobalt, copper, nickel, cerium and of the remaining transition series elements which form a gelatinous hydrated metal oxide when the salts thereof are reacted with a base; dehydrating the hydrated metal oxide in the presence said metal oxides oxidant; and adding a metal azide chosen from the alkali and alkaline earth azides.
Claim 2
Dependent Claim
150 words
A gas generating composition formable into pellets of enhanced strength made by the process comprising the steps of: forming a hydrated metal oxide gel by reacting a base with a metal salt, said metal being selected from the group consisting of aluminum, magnesium, chromium, manganese, iron, cobalt, copper, nickel, cerium and of the remaining transition series elements which form a gelatinous hydrated metal oxide when the salts thereof are reacted with a base; mixing said hydrated metal oxide gel with a metal oxide oxidant chosen from the group consisting of the oxides of aluminum, magnesium, chromium, manganese, iron, cobalt, copper, nickel, cerium and of the remaining transition series elements which form a gelatinous hydrated metal oxide when the salts thereof are reacted with a base; dehydrating the hydrated metal oxide in the presence said metal oxides oxidant; and adding a metal azide chosen from the alkali and alkaline earth azides.
Claim 3
Dependent Claim
27 words
The gas generating composition of claim 1 wherein said metal salt is chosen from the group consisting of the nitrates, chlorides, chlorates and perchlorates of said metals.
Claim 4
Dependent Claim
24 words
The gas generating composition of claim 1 wherein said metal oxide oxidant is mixed with said metal salt prior to reaction with said base.
Claim 5
Dependent Claim
22 words
The gas generating composition of claim 2 wherein the metal oxide oxidant is ferric oxide and the metal salt is ferric nitrate.
Claim 6
Dependent Claim
23 words
The gas generating composition of claim 4 wherein the resultant composition includes between 0.01 and 0.16 moles of nitrate per mole of azide.
Claim 7
Dependent Claim
31 words
The gas generating composition of claim 1 wherein the metal salt is a nitrate and wherein the resultant composition includes between 0.01 and 0.16 moles of nitrate per mole of azide.
Claim 8
Dependent Claim
36 words
The gas generating composition of claim 4 wherein substantially all of the anion of the metal salt is retained in the composition in the form of a salt during dehydration of the hydrated metal oxide gel.
Claim 9
Dependent Claim
15 words
The gas generating composition of claim 1 wherein said base comprises an alkali metal silicate.
Claim 10
Dependent Claim
25 words
The gas generating composition of claim 6 wherein substantially all of the anion of the metal salt is retained in said mixture during said dehydration.
Claim 11
Independent Claim
150 words
A method of making a gas generating composition formable into pellets of enhanced strength comprising the steps of: forming a hydrated metal oxide gel by reacting a base with a metal salt, said metal being selected from the group consisting of aluminum, magnesium, chromium, manganese, iron, cobalt, copper, nickel, cerium and of the remaining transition series elements which form a gelatinous hydrated metal oxide when the salts thereof are reacted with a base; mixing said gel with a particulate metal oxide oxidant chosen from the group consisting of the oxides of aluminum, magnesium, chromium, manganese, iron, cobalt, copper, nickel, cerium and of the remaining transition series elements which form a gelatinous hydrated metal oxide when the salts thereof are reacted with a base; dehydrating the hydrated metal oxide in the presence of said particulate metal oxide oxidant: and adding a metal azide chosen from the alkali and alkaline earth azides.
Claim 12
Independent Claim
150 words
A method of making a gas generating composition formable into pellets of enhanced strength comprising the steps of: forming a hydrated metal oxide gel by reacting a base with a metal salt, said metal being selected from the group consisting of aluminum, magnesium, chromium, manganese, iron, cobalt, copper, nickel, cerium and of the remaining transition series elements which form a gelatinous hydrated metal oxide when the salts thereof are reacted with a base; mixing said gel with a particulate metal oxide oxidant chosen from the group consisting of the oxides of aluminum, magnesium, chromium, manganese, iron, cobalt, copper, nickel, cerium and of the remaining transition series elements which form a gelatinous hydrated metal oxide when the salts thereof are reacted with a base; dehydrating the hydrated metal oxide in the presence of said particulate metal oxide oxidant: and adding a metal azide chosen from the alkali and alkaline earth azides.
Claim 13
Dependent Claim
25 words
The method of claim 10 wherein said metal salt is chosen from the group consisting of the nitrates, chlorides, chlorates and perchlorates of said metals.
Claim 14
Dependent Claim
22 words
The method of claim 10 wherein said metal oxide oxidant is mixed with said metal salt prior to reaction with said base.
Claim 15
Dependent Claim
20 words
The method of claim 10 wherein the metal oxide oxidant is ferric oxide and the metal salt is ferric nitrate.
Claim 16
Dependent Claim
21 words
The method of claim 13 wherein the resultant composition includes between 0.01 and 0.16 moles of nitrate per mole of azide.
Claim 17
Dependent Claim
29 words
The method of claim 10 wherein the metal salt is a nitrate and wherein the resultant composition includes between 0.01 and 0.16 moles of nitrate per mole of azide.
Claim 18
Dependent Claim
27 words
The method of claim 13 wherein substantially all of the anion of the metal salt is retained in the composition during dehydration of the hydrated metal oxide.
Claim 19
Dependent Claim
13 words
The method of claim 10 wherein said base comprises an alkali metal silicate.
Claim 20
Dependent Claim
22 words
The method of claim 15 wherein substantially all of the anion of the metal salt is retained in said mixture during dehydration.
References Cited (Backward Citations)
US3785674A
Cited
US3797854A
Cited
US3741585A
Cited
US3814694A
Cited
US3779823A
Cited
US3904221A
Cited
US3895098A
Cited
US3883373A
Cited
US3947300A
Cited
GB1447460A
Cited
US4021275A
Cited
US4203787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |