US4418622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Munroe effect breaching device
Assignee: United States Department of the Navy
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Filing: 1982-07-02
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Granted: 1983-12-06
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Expires: 2002-07-02
Abstract
Abstract An unlined Munroe Effect device for breaching structures in urban terrain.he device is constructed as an unlined, linear, shaped explosive charge which directs an explosive jet into the structure. The shaped charge is formed with a honeycombed substrate of metal in which the substrate interstices are filled with and the substrate is covered by an explosive material. The substrate is embedded in the explosive material. The explosive material and substrate, prior to curing of the explosive material, are formed into an unlined, semi-cylindrical shape to create the explosive jet or Munroe Effect. The device is initiated or detonated with a booster charge.
Inventors
- 👤 John S. Foster
- 👤 John A. M. Zehmer, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:10
CPC Classifications
F; F42; F42B; F42B1/00; F42B1/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
A Munroe Effect device for breaching walls in urban terrain, comprising: a metallic, honeycombed support structure formed to have concavo-convex surfaces over a linear extent; and an explosive material completely covering said metallic, honeycombed support structure and filling the interstices thereof to define an unlined shaped charge; whereby, upon detonation of said explosive material, the detonation wave melts said metallic, honeycombed support structure to produce a high velocity jet of molten metal directed outwardly from the concave surface for breaching walls in urban terrain.
Claim 2
Dependent Claim
84 words
A Munroe Effect device for breaching walls in urban terrain, comprising: a metallic, honeycombed support structure formed to have concavo-convex surfaces over a linear extent; and an explosive material completely covering said metallic, honeycombed support structure and filling the interstices thereof to define an unlined shaped charge; whereby, upon detonation of said explosive material, the detonation wave melts said metallic, honeycombed support structure to produce a high velocity jet of molten metal directed outwardly from the concave surface for breaching walls in urban terrain.
Claim 3
Dependent Claim
13 words
The device of claim 1 further comprising: means for detonating said explosive material.
Claim 4
Dependent Claim
15 words
The device of claim 1 wherein: said metallic, honeycombed support structure is semicylindrical in shape.
Claim 5
Dependent Claim
15 words
The device of claim 1 wherein: said metallic, honeycombed support structure is constructed of aluminum.
Claim 6
Dependent Claim
17 words
The device of claim 1 wherein: said metallic, honeycombed support structure is constructed of a reactive metal.
Claim 7
Dependent Claim
15 words
the device of claim 1 wherein: said metallic, honeycombed support structure is constructed of magnesium.
Claim 8
Dependent Claim
15 words
The device of claim 1 wherein: said metallic, honeycombed support structure is constructed of zirconium.
Claim 9
Dependent Claim
14 words
The device of claim 1 wherein: said explosive material is a plastic bonded explosive.
Claim 10
Dependent Claim
13 words
The device of claim 1 wherein: said explosive material is a castable explosive.
Claim 11
Dependent Claim
13 words
The device of claim 1 wherein: said explosive material is a curable explosive.
References Cited (Backward Citations)
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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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |