US4798142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid buring propellant charge for automobile air bag inflators, rocket motors, and igniters therefor
Assignee: Northrop Grumman Innovation Systems LLC
•
Filing: 1986-08-18
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Granted: 1989-01-17
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Expires: 2006-08-18
Abstract
Abstract A rapid burning propellant charge for applications including igniters, launch eject motors, and gas generators for automobile air gags. The propellant charge comprises a reticulated substrate having a quantity of interconnected ligaments and a coating of solid propellant material on the ligaments. In order to provide a large amount of surface area for a fast burn time, interstices are between coated ligaments to define propellant surface area for combustion. In applications where minimum smoke is desired, the reticulated substrate is preferably composed of carbon, graphite, or a non-combustible material, and the solid propellant material is preferably a minimum smoke type.
Inventors
- 👤 J. B. Canterberry
- 👤 David A. Flanigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:29
CPC Classifications
B; B60; B60R; B60R21/00; B60R21/02; B60R21/16; B60R21/26; B60R21/264; B60R21/2644; C; C06; C06B; C06B21/00; C06B21/0083; C06B45/00; C06D; C06D5/00; F; F42; F42B; F42B3/00; F42B3/04; F42B5/00; F42B5/02; F42B5/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
43 words
A propellant charge comprises a reticulated substrate having a quantity of interconnected ligaments and a coating of solid propellant material on said ligaments, said coating has a thickness such that interstices are between coated ligaments which interstices define propellant surface area for combustion.
Claim 2
Dependent Claim
43 words
A propellant charge comprises a reticulated substrate having a quantity of interconnected ligaments and a coating of solid propellant material on said ligaments, said coating has a thickness such that interstices are between coated ligaments which interstices define propellant surface area for combustion.
Claim 3
Dependent Claim
40 words
A propellant charge according to claim 1 wherein said reticulated substrate is composed of a material selected from the group consisting of a minimum smoke material and a non-combustible material, and said solid propellant material is a minimum smoke propellant.
Claim 4
Dependent Claim
25 words
A propellant charge according to claim 1 wherein said reticulated substrate is composed of a material selected from the group consisting of carbon and graphite.
Claim 5
Independent Claim
54 words
A method of making a propellant charge comprises the steps of: a. preparing a reticulated substrate having a quantity of interconnected ligaments, b. coating the ligaments with a solid propellant material, and c. maintaining the thickness of the coating such that interstices are between coated ligaments which interstices define propellant surface area for combustion.
Claim 6
Independent Claim
54 words
A method of making a propellant charge comprises the steps of: a. preparing a reticulated substrate having a quantity of interconnected ligaments, b. coating the ligaments with a solid propellant material, and c. maintaining the thickness of the coating such that interstices are between coated ligaments which interstices define propellant surface area for combustion.
Claim 7
Dependent Claim
42 words
A method according to claim 4 wherein the step of coating the ligaments comprises dip coating the ligaments in a propellant lacquer prepared by dissolving the solid propellant material in a solvent, and further comprises allowing the dip coated ligaments to dry.
Claim 8
Dependent Claim
34 words
A method according to claim 4 wherein the step of coating the ligaments comprises spraying propellant material which is dissolved in a solvent onto the ligaments and allowing the spray coated ligaments to dry.
Claim 9
Dependent Claim
30 words
A method according to claim 4 further comprises composing the reticulated substrate from a non-combustible or minimum smoke material, and composing the solid propellant material from a minimum smoke propellant.
References Cited (Backward Citations)
US3125542A
Cited
US3829537A
Cited
US2977885A
Cited
US3140663A
Cited
US3109374A
Cited
US3109375A
Cited
US2961710A
Cited
US3811380A
Cited
US3163113A
Cited
US3191535A
Cited
US3367268A
Cited
US3165483A
Cited
US3822645A
Cited
US3308210A
Cited
US3175030A
Cited
US3175025A
Cited
US3171820A
Cited
US3230281A
Cited
US3664133A
Cited
US3499283A
Cited
US3389025A
Cited
US3925122A
Cited
US3616841A
Cited
US3946039A
Cited
US3897221A
Cited
US3711115A
Cited
US3764420A
Cited
US3756025A
Cited
US4072546A
Cited
US3807171A
Cited
US3827715A
Cited
US3860678A
Cited
US4116466A
Cited
US3972545A
Cited
US4083905A
Cited
US4321220A
Cited
US4370181A
Cited
US4418622A
Cited
US4547342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-17 | 1992-07-18 | 1993-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-17 | 1996-07-18 | 1997-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-17 | 2000-07-18 | 2001-01-17 | $7700.00 | Window Closed / Lapsed |