US3883376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High reactivity fuels for supersonic combustion ramjets
Assignee: United States Department of the Navy
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Filing: 1973-05-07
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Granted: 1975-05-13
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Expires: 1993-05-07
Abstract
Abstract The invention relates to highly reactive fuel compositions primarily intended for supersonic combustion ramjet engines. In particular, the invention provides highly reactive fuel compositions capable of efficient oxidation and thrust production even within the low combustor residence time of a supersonic combustion ramjet engine. The fuel compositions comprise specific blends of a major fuel component and an additive which, on pyrophoric combustion thereof, produces sufficient heat energy to spontaneously ignite and burn the major fuel component at a substantially increased rate.
Inventors
- 👤 Frederick S Billig
- 👤 Jr James C Pirkle
- 👤 Jr Stephen E Grenleski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:32
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/30; C10L1/301
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
A FUEL COMPOSITION CAPABLE OF IGNITION WITHIN THE LOW RESIDENCE TIMES OCCURING IN A SUPERSONIC RAMJET COMBUSTION ENGINE COMPRISING: A HYDROGEN SELECTED FROM THE GROUP CONSISTING OF NDODECANE, METHYLCYCLOPENTADIENE DIMER, AND TETRA-HYDRO METHYLCYCLOPENTADIENE DIMER, THE HYDROCARBON BEING PRESENT IN THE FUEL COMPOSITION IN A PROPORTION EQUAL TO AT LEAST 50 PERCENT ANND NOT MORE THAN 87.5 PERCENT BY WEIGHT THEREOF, AND A PYROPHORIC ADDITIVE COMPONENT SELECTED FROM THE GROUP CONSISTING OF RESPECTIVE MIXTURES OF TRIMETHYLALUMINUM AND ETHYLDECARBORANE, TRIMETHYLALUMINUM AND PENTABORANE, TRIETHYLALUMINUM, ETHYLDECABORANE, AND DIETHYLDECARBORANE, AND TRIMETHYALUMINUM, ETHYLDECABORANE, AND DIETHYLDECABORANE, THE ADDITIVE COMPONENT BEING PRESENT IN THE FUEL COMPOSITION IN A PROPORTION EQUAL TO NOT MORE THAN 50 PERCENT BY WEIGHT THEREOF AND WHEREIN THE FIRST-NAMED CONSTITUENT OF EACH MIXED ADDITIVE COMPONENT CONSTITUTED AT LEAST 20 PERCENT OF THE ADDITIVE COMPONENT BY WEIGHT.
Claim 2
Dependent Claim
132 words
A FUEL COMPOSITION CAPABLE OF IGNITION WITHIN THE LOW RESIDENCE TIMES OCCURING IN A SUPERSONIC RAMJET COMBUSTION ENGINE COMPRISING: A HYDROGEN SELECTED FROM THE GROUP CONSISTING OF NDODECANE, METHYLCYCLOPENTADIENE DIMER, AND TETRA-HYDRO METHYLCYCLOPENTADIENE DIMER, THE HYDROCARBON BEING PRESENT IN THE FUEL COMPOSITION IN A PROPORTION EQUAL TO AT LEAST 50 PERCENT ANND NOT MORE THAN 87.5 PERCENT BY WEIGHT THEREOF, AND A PYROPHORIC ADDITIVE COMPONENT SELECTED FROM THE GROUP CONSISTING OF RESPECTIVE MIXTURES OF TRIMETHYLALUMINUM AND ETHYLDECARBORANE, TRIMETHYLALUMINUM AND PENTABORANE, TRIETHYLALUMINUM, ETHYLDECABORANE, AND DIETHYLDECARBORANE, AND TRIMETHYALUMINUM, ETHYLDECABORANE, AND DIETHYLDECABORANE, THE ADDITIVE COMPONENT BEING PRESENT IN THE FUEL COMPOSITION IN A PROPORTION EQUAL TO NOT MORE THAN 50 PERCENT BY WEIGHT THEREOF AND WHEREIN THE FIRST-NAMED CONSTITUENT OF EACH MIXED ADDITIVE COMPONENT CONSTITUTED AT LEAST 20 PERCENT OF THE ADDITIVE COMPONENT BY WEIGHT.
Claim 3
Dependent Claim
141 words
A fuel composition capable of ignition within the low residence times occurring in a supersonic ramjet combustion engine comprising: methylcyclopentadiene dimer having a weight percent of at least 80 percent of the total composition; and, a pyrophoric additive component selected from the group consisting of respective mixtures of trimethylaluminum and pentaborane having relative weight percents of at least 8 percent and at least 9 percent respectively of the total composition; triethylaluminum, diethyldecaborane, and ethyldecaborane having relative weight percents of at least 6 percent of the total composition for triethylaluminum and at least 6 percent of the total composition for the mixture of diethyldecaborane and ethyldecaborane; and trimethylaluminum, diethyldecaborane, and ethyldecaborane having relative weight percents of at least 6 percent of the total composition for trimethylaluminum and at least 8 percent of the total composition for the mixture of diethyldecaborane and ethyldecaborane.
Claim 4
Dependent Claim
141 words
A fuel composition capable of ignition within the low residence times occurring in a supersonic ramjet combustion engine comprising: methylcyclopentadiene dimer having a weight percent of at least 80 percent of the total composition; and, a pyrophoric additive component selected from the group consisting of respective mixtures of trimethylaluminum and pentaborane having relative weight percents of at least 8 percent and at least 9 percent respectively of the total composition; triethylaluminum, diethyldecaborane, and ethyldecaborane having relative weight percents of at least 6 percent of the total composition for triethylaluminum and at least 6 percent of the total composition for the mixture of diethyldecaborane and ethyldecaborane; and trimethylaluminum, diethyldecaborane, and ethyldecaborane having relative weight percents of at least 6 percent of the total composition for trimethylaluminum and at least 8 percent of the total composition for the mixture of diethyldecaborane and ethyldecaborane.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |