US4158583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High performance ammonium nitrate propellant
Assignee: National Aeronautics and Space Administration
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Filing: 1977-12-16
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Granted: 1979-06-19
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Expires: 1997-12-16
Abstract
Abstract A high performance propellant having greatly reduced hydrogen chloride emission is disclosed comprising a minor amount of hydrocarbon binder (10-15%) and at least 85% solids including ammonium nitrate as the primary oxidizer (about 40% to 70%), a significant amount (5-25%) powdered metal fuel, such as aluminum, a small amount (5-25%) of ammonium perchlorate as a supplementary oxidizer and optionally a small amount (0-20%) of a nitramine such as HMX.
Inventors
- 👤 with respect to an invention of Frosch Robert A. Administrator of the National Aeronautics and Space Administration
- 👤 Floyd A. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:39
CPC Classifications
C; C06; C06B; C06B33/00; C06B33/12; C06B33/14; C06B23/00; C06B23/007; C06B45/00; C06B45/04; C06B45/06; C06B45/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
A solid rocket propellant having greatly reduced hydrogen chloride emission comprising: about 10-15% of an elastomeric butadiene polymer binder containing over 85% by weight solids; the solids including 40% to 70% ammonium nitrate as a primary oxidizer, 5% to 20% powdered metal fuel and 5% to 35% of a secondary oxidizer including 5% to 25% ammonium perchlorate and 10% to 20% of an organic nitramine oxidizer.
Claim 2
Dependent Claim
66 words
A solid rocket propellant having greatly reduced hydrogen chloride emission comprising: about 10-15% of an elastomeric butadiene polymer binder containing over 85% by weight solids; the solids including 40% to 70% ammonium nitrate as a primary oxidizer, 5% to 20% powdered metal fuel and 5% to 35% of a secondary oxidizer including 5% to 25% ammonium perchlorate and 10% to 20% of an organic nitramine oxidizer.
Claim 3
Dependent Claim
31 words
A propellant according to claim 1 in which the butadiene polymer is a hydroxy-terminated polybutadiene having an equivalent weight from 1,000 to 5,000 and a functionality from about 1.7 to 3.0.
Claim 4
Dependent Claim
21 words
A propellant according to claim 2 in which the butadiene polymer is cured with a stoichiometric amount of a cycloaliphatic diisocyanate.
Claim 5
Dependent Claim
13 words
A propellant according to claim 3 in which the diisocyanate is isophorone diisocyanate.
Claim 6
Dependent Claim
34 words
A propellant according to claim 1 in which the binder is present in an amount from 10% to 15% by weight and the binder further includes from 30% to 50% of an oxygenated plasticizer.
Claim 7
Dependent Claim
16 words
A propellant according to claim 5 in which the oxygenated plasticizer is a higher alkyl ester.
Claim 8
Dependent Claim
13 words
A propellant according to claim 6 in which the plasticizer is dioctyl adipate.
Claim 9
Dependent Claim
25 words
A propellant according to claim 1, in which the secondary oxidizer is a mixture of 5% to 15% ammonium perchlorate and 10% to 20% cyclotetramethylenetetranitramine.
Claim 10
Dependent Claim
39 words
A propellant according to claim 8 further including from 0.5% to 3% of a burning rate modifier selected from Fe 2 O 3 , copper chromite, FeF 3 , Milori Blue, Ferrocene, iron phthalocyanine, ammonium dichromate and mixtures thereof.
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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) | 1982-06-18 | 1982-12-18 | 1983-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-18 | 1986-12-18 | 1987-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-18 | 1990-12-18 | 1991-06-19 | $7700.00 | Window Closed / Lapsed |