US4649795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structural shroud system incorporating a pyrotechnic
Assignee: Hi Shear Corp
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Filing: 1984-05-16
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Granted: 1987-03-17
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Expires: 2004-05-16
Abstract
Abstract A shroud to protect airborne stores from excessive temperatures generated by aerodynamic friction. The shroud includes a structural member which acts as a cover that comprises a matrix and a pyrotechnic. The autoignition temperature is above that of the temperatures which are generated. Upon ignition, the pyrotechnic mixture and the structural element disintegrated into gases or into particles which are so small as not to constitute a risk to nearby structure in flight.
Inventors
- 👤 Donald E. Olander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:17
CPC Classifications
B; B64; B64D; B64D7/00; B64D1/00; B64D1/02; B64D1/08; B64D1/12; F; F42; F42B; F42B15/00; F42B15/34
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
129 words
A shroud to cover an airborne article to protect said article from excessive temperatures caused by aerodynamic friction, said shroud comprising a structural member having sufficient rigidity and strength to withstand aerodynamic forces, and the property of disintegrating into gases, or into particles which are so small as to constitute no appreciable hazard to nearby structure in flight, said member being made of an ignitable pyrotechnic mixture contained within a matrix, which matrix will burn into gases or char into particles when said pyrotechnic mixture is ignited, which particles are so small as to constitute no appreciable hazard to nearby structure in flight having an autoignition temperature higher than the anticipated highest temperature to be developed in said element during flight; and igniter means to ignite said pyrotechnic mixture.
Claim 2
Dependent Claim
129 words
A shroud to cover an airborne article to protect said article from excessive temperatures caused by aerodynamic friction, said shroud comprising a structural member having sufficient rigidity and strength to withstand aerodynamic forces, and the property of disintegrating into gases, or into particles which are so small as to constitute no appreciable hazard to nearby structure in flight, said member being made of an ignitable pyrotechnic mixture contained within a matrix, which matrix will burn into gases or char into particles when said pyrotechnic mixture is ignited, which particles are so small as to constitute no appreciable hazard to nearby structure in flight having an autoignition temperature higher than the anticipated highest temperature to be developed in said element during flight; and igniter means to ignite said pyrotechnic mixture.
Claim 3
Dependent Claim
16 words
A shroud according to claim 1 in which said pyrotechnic mixture is dispersed throughout said matrix.
Claim 4
Dependent Claim
14 words
A shroud according to claim 1 in which said matrix is a carbon-containing composition.
Claim 5
Dependent Claim
24 words
A shroud according to claim 3 in which said matrix is selected from the group consisting of settable phenolics, settable epoxies, and settable polyesters.
Claim 6
Dependent Claim
31 words
A shroud according to claim 1 in which the pyrotechnic mixture has within itself sufficient reactants to generate after ignition the temperatures required to char or burn the matrix as aforesaid.
Claim 7
Dependent Claim
14 words
A shroud according to claim 5 in which the pyrotechnic is a two-substance system.
Claim 8
Dependent Claim
35 words
A shroud according to claim 5 in which the pyrotechnic mixture is selected from the group consisting of a mixture of magnesium metal and silicon dioxide, and a mixture of iron oxide and aluminum metal.
Claim 9
Dependent Claim
35 words
A shroud according to claim 7 in which the pyrotechnic mixture is magnesium metal and silicon dioxide, and in which the silicon dioxide is provided as a fiber to give physical strength to the element.
Claim 10
Dependent Claim
46 words
A shroud according to claim 1 further including in combination in a spacing between said article and said element an insulating filling which, when said element is disintegrated, also forms particles which are so small as to constitute no appreciable hazard to nearby structure in flight.
Claim 11
Dependent Claim
30 words
A shroud according to claim 9 in which said insulating filling is selected from the group consisting of cork, carbon foam, and carbon-carbon laminar structures having only slight laminar strength.
Claim 12
Dependent Claim
13 words
A shroud according to claim 9 in which said filling is cork powder.
Claim 13
Dependent Claim
16 words
A shroud according to claim 11 in which said pyrotechnic comprises magnesium metal and silicon dioxide.
Claim 14
Dependent Claim
14 words
A shroud according to claim 12 in which said matrix is a carbon-containing composition.
Claim 15
Dependent Claim
24 words
A shroud according to claim 13 in which said matrix is selected from the group consisting of settable phenolics, settable epoxies, and settable polyesters.
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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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |