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US4938813A
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Solid rocket fuels
Assignee: Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung eV
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Filing: 1989-10-23
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Granted: 1990-07-03
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Expires: 2009-10-23
Abstract
Abstract Solid rocket fuels with a low pressure exponent and with little or no signature comprise high-energy nitramine compounds in an amount of 50-90% by weight, an azide group-containing, high-energy binder system of polymers and plasticizers in an amount of 8-50% by weight and heavy metal catalysts in the form of lead, tin or copper compounds in an amount of 0.5 to 10% by weight.
Inventors
- 👤 Siegfried Eisele
- 👤 Klaus Menke
- 👤 Hiltmar Schubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:23
CPC Classifications
C; C06; C06B; C06B25/00; C06B25/34; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C06B45/105
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
51 words
Solid rocket fuels comprising high-energy nitramine compounds in an amount of 50-90% by weight, a high-energy, azide group-containing binder system of polymers and plasticizers in an amount of 8-50% by weight and heavy metal catalysts in the form of lead, tin or copper compounds in an amount of 0.5-10% by weight.
Claim 2
Dependent Claim
51 words
Solid rocket fuels comprising high-energy nitramine compounds in an amount of 50-90% by weight, a high-energy, azide group-containing binder system of polymers and plasticizers in an amount of 8-50% by weight and heavy metal catalysts in the form of lead, tin or copper compounds in an amount of 0.5-10% by weight.
Claim 3
Dependent Claim
45 words
Solid rocket fuels according to claim 1, wherein the azide group-containing binder system is selected from the group consisting of: (a) azide polymers and at least one of high-energy and inert plasticizers; (b) inert polymers and azide plasticizers; and (c) azide polymers and azide plasticizers.
Claim 4
Dependent Claim
44 words
Solid rocket fuels according to claim 1, wherein the nitramine compounds are used in an amount of 60-85% by weight, the azide group-containing binder system in an amount of 15-40% by weight and the heavy metal catalysts in an amount of 1-5% by weight.
Claim 5
Dependent Claim
28 words
Solid rocket fuels according to claim 1, wherein at least one selected from the group consisting of octogen, hexogen, nitroguanidine and tetryl is used as the nitramine compounds.
Claim 6
Dependent Claim
26 words
Solid rocket fuels according to claim 1, wherein the azide group-containing binder system contains 20-100% by weight of polymers and 0-80% by weight of high-energy plasticizers.
Claim 7
Dependent Claim
26 words
Solid rocket fuels according to claim 5, wherein the azide group-containing binder system contains 30-70% by weight of polymers and 30-70% by weight of high-energy plasticizers.
Claim 8
Dependent Claim
28 words
Solid rocket fuels according to claim 6, wherein the polymers are azide polymers, and the high-energy plasticizers are selected from the group consisting of esters and nitro compounds.
Claim 9
Dependent Claim
30 words
Solid rocket fuels according to claim 7, wherein said high-energy plasticizers are selected from the group consisting of nitroglycerine, butane triol trinitrate, trimethylol ethane trinitrate, diethylene glycol dinitrate, and bisdinitropropylformal/acetal.
Claim 10
Dependent Claim
28 words
Solid rocket fuels according to claim 5, wherein the polymers are azide polymers, and the high-energy plasticizers are selected from the group consisting of esters and nitro compounds.
Claim 11
Dependent Claim
30 words
Solid rocket fuels according to claim 9, wherein said high-energy plasticizers are selected from the group consisting of nitroglycerine, butane triol trinitrate, trimethylol ethane trinitrate, diethylene glycol dinitrate, and bisdinitropropylformal/acetal.
Claim 12
Dependent Claim
45 words
Solid rocket fuels according to claim 1, wherein the azide group-containing binder system includes at least one of polymers and azide plasticizers, and also includes an inert plasticizer selected from the group consisting of alkyl acetates, phthalates and adipates, and citric and phosphoric acid esters.
Claim 13
Dependent Claim
39 words
Solid rocket fuels according to claim 1, wherein the heavy metal catalysts in the form of lead, tin or copper compounds are selected from the group consisting of lead, tin or copper as oxides, inorganic salts and organic salts.
Claim 14
Dependent Claim
33 words
Solid rocket fuels according to claim 1, wherein the fuels additionally include burn-off moderators in the form of carbon or, on combustion, carbon-yielding substances, in an amount of 0.2 to 3% by weight.
Claim 15
Dependent Claim
26 words
Solid rocket fuels according to claim 13, wherein the burn-off moderators are selected from the group consisting of carbon black, carbon fibers, activated carbon and graphite.
Claim 16
Dependent Claim
22 words
Solid rocket fuels according to claim 1, wherein the fuels further include metal powders in an amount of 1-20%, as power-increasing additives.
Claim 17
Dependent Claim
44 words
Solid rocket fuels according to claim 2, wherein the nitramine compounds are used in an amount of 60-85% by weight, the azide group-containing binder system in an amount of 15-40% by weight and the heavy metal catalysts in an amount of 1-5% by weight.
Claim 18
Dependent Claim
28 words
Solid rocket fuels according to claim 16, wherein at least one selected from the group consisting of octogen, hexogen, nitroguanidine and tetryl is used as the nitramine compounds.
Claim 19
Dependent Claim
26 words
Solid rocket fuels according to claim 17, wherein the azide group-containing binder system contains 20-100% by weight of polymers and 0-80% by weight of high-energy plasticizers.
Claim 20
Dependent Claim
28 words
Solid rocket fuels according to claim 18, wherein the polymers are azide polymers, and the high-energy plasticizers are selected from the group consisting of esters and nitro compounds.
Claim 21
Dependent Claim
45 words
Solid rocket fuels according to claim 19, wherein the azide group-containing binder system includes at least one of polymers and azide plasticizers, and also includes an inert plasticizer selected from the group consisting of alkyl acetates, phthalates and adipates, and citric and phosphoric acid esters.
Claim 22
Dependent Claim
39 words
Solid rocket fuels according to claim 20, wherein the heavy metal catalysts in the form of lead, tin or copper compounds are selected from the group consisting of lead, tin or copper as oxides, inorganic salts and organic salts.
Claim 23
Dependent Claim
33 words
Solid rocket fuels according to claim 21, wherein the fuels additionally include burn-off moderators in the form of carbon or, on combustion, carbon-yielding substances, in an amount of 0.2 to 3% by weight.
Claim 24
Dependent Claim
22 words
Solid rocket fuels according to claim 21, wherein the fuels further include metal powders in an amount of 1-20%, as power-increasing additives.
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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) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |