Patent US3365594A successfully refreshed from Google Patents.
Patent US4815385A successfully refreshed from Google Patents.
US4815385A
Expired / Lapsed
US
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Blast focusing method and apparatus
Assignee: United States Department of the Army
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Filing: 1987-12-16
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Granted: 1989-03-28
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Expires: 2007-12-16
Abstract
Abstract A blast focusing technique for producing high pressure on a ground plane, in which a right circular cylinder of explosive material is positioned adjacent the ground plane with the cylinder axis orthogonal to the ground plane. The cylinder is simultaneously detonated at both ends by detonators disposed on the cylinder axis at each end of the cylinder.
Inventors
- 👤 Charles N. Kingery
- 👤 John D. Sullivan, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:27
CPC Classifications
F; F42; F42B; F42B1/00; F41; F41H; F41H11/00; F41H11/12; F42B12/00; F42B12/02; F42B12/20; F42B12/201; F42B12/204
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
82 words
A blast focusing technique for producing high pressure on a ground plane, which comprises the steps of: disposing an explosive element adjacent the ground plane, the element having an axis of symmetry extending between opposite ends of the element, and the element being disposed so that the element axis of symmetry is essentially orthogonal to the ground plane; and detonating the explosive element, the detonation being initiated on the element axis at the two opposite element ends at approximately the same time.
Claim 2
Dependent Claim
82 words
A blast focusing technique for producing high pressure on a ground plane, which comprises the steps of: disposing an explosive element adjacent the ground plane, the element having an axis of symmetry extending between opposite ends of the element, and the element being disposed so that the element axis of symmetry is essentially orthogonal to the ground plane; and detonating the explosive element, the detonation being initiated on the element axis at the two opposite element ends at approximately the same time.
Claim 3
Dependent Claim
35 words
A blast focusing technique, as described in claim 1, wherein the explosive element is a right circular cylinder of explosive material having a diameter and having a length which is greater than the cylinder diameter.
Claim 4
Dependent Claim
24 words
A blast focusing technique, as described in claim 2, wherein the ratio of the cylinder length to the cylinder diameter does not exceed 6.
Claim 5
Dependent Claim
27 words
A blast focusing technique, as described in claim 2, wherein the cylinder is disposed less than two cylinder lengths from the ground plane when detonation is initiated.
Claim 6
Dependent Claim
84 words
A blast focusing technique, as described in claim 1, wherein the explosive element is disposed in a projectile directed along a path of flight to the ground plane and wherein the step of disposing the explosive element further comprises the steps of: disposing the explosive element during flight so that the element axis is essentially vertical as the projectile approaches the ground plane; and sensing when the explosive element is disposed a predetermined distance from the ground plane at which disposition detonation is initiated.
Claim 7
Dependent Claim
115 words
A projectile for producing high pressure on a ground plane to which the projectile is directed along a path of flight, the projectile comprising: an explosive element having an axis of symmetry extending between opposite ends of the element; detonation means for initiating detonation of the element on the element axis at the two opposite element ends at approximately the same time; attitude adjustment means for adjusting the attitude of the explosive element during flight so that the element axis is essentially orthogonal to the ground plane as the projectile approaches the ground plane; and sensing means for activating the detonation means when the explosive element is disposed a predetermined distance from the ground plane.
Claim 8
Dependent Claim
115 words
A projectile for producing high pressure on a ground plane to which the projectile is directed along a path of flight, the projectile comprising: an explosive element having an axis of symmetry extending between opposite ends of the element; detonation means for initiating detonation of the element on the element axis at the two opposite element ends at approximately the same time; attitude adjustment means for adjusting the attitude of the explosive element during flight so that the element axis is essentially orthogonal to the ground plane as the projectile approaches the ground plane; and sensing means for activating the detonation means when the explosive element is disposed a predetermined distance from the ground plane.
Claim 9
Dependent Claim
19 words
A projectile, as described in claim 6, wherein the explosive element is a right circular cylinder of explosive material.
Claim 10
Dependent Claim
22 words
A projectile, as described in claims 7, wherein the ratio of the cylinder length to the cylinder diameter does not exceed 6.
Claim 11
Dependent Claim
17 words
A projectile, as described in claim 7, wherein said predetermined distance is less than two cylinder lengths.
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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) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |