Patent US4017342A successfully refreshed from Google Patents.
US4017342A
Expired / Lapsed
US
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Method for improving metal combustion in solid rocket propellants
Assignee: United States Department of the Air Force
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Filing: 1976-04-05
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Granted: 1977-04-12
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Expires: 1996-04-05
Abstract
Abstract A method for improving the ballistic properties of aluminum powder based rocket propellants by treating the aluminum powder with hydrogen fluoride gas prior to its incorporation into a propellant formulation.
Inventors
- 👤 Robert L. Geisler
- 👤 Arnold M. Crelier
- 👤 Francisco Q. Roberto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:44
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/18; C06B45/30; C06B21/00; C06B21/0083
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
53 words
A method for improving the combustibility of aluminum metal powders for use in solid rocket propellant formulations which comprises the step of exposing aluminum oxide coated aluminum metal powder, having a particle size smaller than about 100 microns to hydrogen fluoride gas for a period of time sufficient to effect a reaction therebetween.
Claim 2
Independent Claim
53 words
A method for improving the combustibility of aluminum metal powders for use in solid rocket propellant formulations which comprises the step of exposing aluminum oxide coated aluminum metal powder, having a particle size smaller than about 100 microns to hydrogen fluoride gas for a period of time sufficient to effect a reaction therebetween.
Claim 3
Independent Claim
87 words
A method for improving the combustibility of aluminum metal powders for use in solid rocket propellant formulations which comprises the steps of (a) exposing particles of an aluminum oxide coated aluminum metal powder smaller than about 100 microns to flowing hydrogen fluoride gas to effect an exothermic reaction therebetween; (b) continuing said reaction for a period of time sufficient to effect a replacement of said aluminum oxide coating with an aluminum fluoride coating; and (c) removing the resultant aluminum fluoride coated powder particles from said gas flow.
Claim 4
Independent Claim
87 words
A method for improving the combustibility of aluminum metal powders for use in solid rocket propellant formulations which comprises the steps of (a) exposing particles of an aluminum oxide coated aluminum metal powder smaller than about 100 microns to flowing hydrogen fluoride gas to effect an exothermic reaction therebetween; (b) continuing said reaction for a period of time sufficient to effect a replacement of said aluminum oxide coating with an aluminum fluoride coating; and (c) removing the resultant aluminum fluoride coated powder particles from said gas flow.
Claim 5
Dependent Claim
30 words
A method in accordnce with claim 2 wherein said particles are exposed to hydrogen fluoride gas at a temperature of about 25° C for a period of about 30 minutes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |