Patent US3958417A successfully refreshed from Google Patents.
US3958417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suppression of unstable burning in rocket motors
Assignee: Imperial Metal Industries Kynoch Ltd
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Filing: 1967-11-14
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Granted: 1976-05-25
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Expires: 1987-11-14
Abstract
Abstract A method of suppressing unstable burning in a solid propellant rocket motor comprising combusting a silicone elastomer with burning of the solid propellant to produce a continuous stream of small silica particles which suppress instability.
Inventors
- 👤 Stuart Gordon
- 👤 Geoffrey Ian Evans
- 👤 Philip Graham Jones
- 👤 Stephen William Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:14
CPC Classifications
C; C06; C06B; C06B23/00; C06B23/007; C06B45/00; C06B45/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
A solid propellant rocket motor comprising: a casing; a nitric ester nitrocellulose cast double base propellant within the casing; and a layer of combustion-inhibition material bonded to the surfaces of the propellant of which combustion inhibition is required, said combustion-inhibition material being a self-supporting silicone elastomer, at least part of said layer of combustion-inhibition material being exposed for at least partial burning during combustion of the propellant, said elastomer being present in an amount in excess of the amount combusted during combustion of the propellant.
Claim 2
Dependent Claim
85 words
A solid propellant rocket motor comprising: a casing; a nitric ester nitrocellulose cast double base propellant within the casing; and a layer of combustion-inhibition material bonded to the surfaces of the propellant of which combustion inhibition is required, said combustion-inhibition material being a self-supporting silicone elastomer, at least part of said layer of combustion-inhibition material being exposed for at least partial burning during combustion of the propellant, said elastomer being present in an amount in excess of the amount combusted during combustion of the propellant.
Claim 3
Dependent Claim
25 words
A rocket motor according to claim 1 wherein the silicone elastomer constitutes approximately 1% to 20% of the combined weights of silicone elastomer and propellant.
Claim 4
Dependent Claim
39 words
A rocket motor according to claim 1 wherein at least part of said layer of silicone elastomer is interposed between and bonded to the casing and the propellant to case-bond the propellant in the casing of the rocket motor.
Claim 5
Independent Claim
113 words
A method of suppressing unstable burning and inhibiting combustion in a solid propellant rocket motor having a casing and a nitric ester nitrocellulose cast double base propellant within the casing, said method comprising: bonding a layer of a self-supporting silicone elastomer to those surfaces of the propellant of which combustion inhibition is required at a location such that at least part of the layer is exposed for at least partial burning during combustion of the propellant, said elastomer being provided in an amount in excess of the amount which will be combusted during operation of the motor; and subsequently combusting the elastomer with the burning of the propellant during operation of the motor.
Claim 6
Independent Claim
113 words
A method of suppressing unstable burning and inhibiting combustion in a solid propellant rocket motor having a casing and a nitric ester nitrocellulose cast double base propellant within the casing, said method comprising: bonding a layer of a self-supporting silicone elastomer to those surfaces of the propellant of which combustion inhibition is required at a location such that at least part of the layer is exposed for at least partial burning during combustion of the propellant, said elastomer being provided in an amount in excess of the amount which will be combusted during operation of the motor; and subsequently combusting the elastomer with the burning of the propellant during operation of the motor.
Claim 7
Dependent Claim
25 words
A method as in claim 4 wherein the silicone elastomer constitutes approximately 1% to 20% of the combined weights of the elastomer and the propellant.
Claim 8
Dependent Claim
39 words
A method as in claim 4 wherein at least part of said layer of silicone elastomer is interposed between and bonded to the casing and to the propellant to case-bond the propellant in the casing of the rocket motor.
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) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |