US4458483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rocket motor end flap
Assignee: United States Department of the Navy
•
Filing: 1982-10-21
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Granted: 1984-07-10
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Expires: 2002-10-21
Abstract
Abstract An end flap construction for a rocket motor prevents hot vapors from enteg the motor void and causing motor ignition.
Inventors
- 👤 Ronald F. Vetter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:15
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/38; F02K9/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
A safety device for a rocket motor having a propellant grain with a central void comprising: a sheet of rigid material having an inner and outer surface configured to close said propellant grain; a layer of adhesive securing said sheet of material to said grain about the periphery of said inner surface thereof; a stiffener separate from but attached to the exterior surface of said sheet of rigid material; and a thermally stable coating over said sheet and said stiffener.
Claim 2
Dependent Claim
80 words
A safety device for a rocket motor having a propellant grain with a central void comprising: a sheet of rigid material having an inner and outer surface configured to close said propellant grain; a layer of adhesive securing said sheet of material to said grain about the periphery of said inner surface thereof; a stiffener separate from but attached to the exterior surface of said sheet of rigid material; and a thermally stable coating over said sheet and said stiffener.
Claim 3
Dependent Claim
15 words
A safety device according to claim 1 wherein said sheet is a reinforced glass-cloth material.
Claim 4
Dependent Claim
14 words
A safety device according to claim 1 wherein said stiffener is a cork membrane.
Claim 5
Dependent Claim
18 words
A safety device according to claim 1 wherein said thermally stable coating is formed of a silicone material.
Claim 6
Dependent Claim
14 words
A safety device according to claim 2 wherein said stiffener is a cork membrane.
Claim 7
Dependent Claim
18 words
A safety device according to claim 2 wherein said thermally stable coating is formed of a silicone material.
Claim 8
Dependent Claim
18 words
A safety device according to claim 3 wherein said thermally stable coating is formed of a silicone material.
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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) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |