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Patent US4592283A successfully refreshed from Google Patents.
US4592283A
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Explosive shell case
Assignee: Saab Bofors AB
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Filing: 1985-03-21
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Granted: 1986-06-03
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Expires: 2005-03-21
Abstract
Abstract An explosive shell case of the kind in which fragments are produced by bursting of the case material into a number of small particles. The case material comprises a completely dense, non-compressible material which is made with embrittling zones (4) which when the shell bursts gives fragments of a predetermined shape. The case is preferably manufactured powder-metallurgically, the embrittling zones then being formed by filling at predetermined intervals with powder with the embrittling component. The case is then pressed under high all-round pressure and high temperature into a dense, compact jacket and is imparted its final properties through heat treatment.
Inventors
- 👤 Lars Hellner
- 👤 Ingemar Haglund
- 👤 Torsten Ronn
- 👤 Kjell Albrektsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:40
CPC Classifications
F; F42; F42B; F42B12/00; F42B12/02; F42B12/20; F42B12/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
67 words
An explosive shell case of the type in which fragmentation is accomplished by bursting of the shell material into a plurality of small particles, wherein the shell case comprises a plurality of zones consisting of a completely dense, non-compressible material said zones being separated from each other by a plurality of zones of embrittling material whereby upon detonation the shell bursts into fragments of a predetermined shape.
Claim 2
Dependent Claim
67 words
An explosive shell case of the type in which fragmentation is accomplished by bursting of the shell material into a plurality of small particles, wherein the shell case comprises a plurality of zones consisting of a completely dense, non-compressible material said zones being separated from each other by a plurality of zones of embrittling material whereby upon detonation the shell bursts into fragments of a predetermined shape.
Claim 3
Dependent Claim
22 words
A shell case as claimed in claim 1 wherein the embrittline zones divide the shell case axially into a plurality of zones.
Claim 4
Dependent Claim
31 words
A shell case as claimed in claim 1 wherein the case material consists of a hardenable steel in which the embrittling zones are formed by admixture therein of an embrittling component.
Claim 5
Dependent Claim
29 words
A shell case as claimed in claim 1 wherein the embrittling component consists of at least one member selected from the group consisting of graphite, phosphorus, carbides and oxides.
Claim 6
Dependent Claim
37 words
A shell case as claimed in claim 1 wherein the embrittling zones have an extension in the axial direction which is significantly less than the extension in the axial direction of the intermediate sections of the case.
Claim 7
Dependent Claim
87 words
A method of manufacturing a shell case as claimed in claim 1, wherein the case is manufactured by forming a powder mass into a shell case by a powder metallurgical procedure comprising the steps of forming a plurality of embrittling zones in said case by introducing at predetermined intervals an embrittling component into the powder mass, thereafter pressing said powder mass under high isostatic pressure and high temperature into a dense, compact case, and subjecting the resulting case shell to heat treatment for imparting its final properties.
Claim 8
Dependent Claim
24 words
A method as claimed in claim 6 wherein the embrittling zones are formed by filling, at predetermined intervals with powder containing an embrittling component.
Claim 9
Dependent Claim
29 words
A method as claimed in claim 6 wherein the embrittling zones are formed by stacking pressed rings of normal powder alternately with rings of powder containing the embrittling component.
Claim 10
Dependent Claim
28 words
A method as claimed in claim 6 wherein the heat treatment comprises controlled cooling, hardening or normalization from about 800°-1300° C. and tempering up to about 700° C.
Claim 11
Dependent Claim
23 words
A method as claimed in claim 6 wherein the heat treatment comprises hardening from about 800°-1000° C. and tempering at about 200°-400° C.
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) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |