Patent US4458599A successfully refreshed from Google Patents.
US4458599A
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Frangible tungsten penetrator
Assignee: Osram Sylvania Inc
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Filing: 1981-08-27
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Granted: 1984-07-10
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Expires: 2001-08-27
Abstract
Abstract A material consisting essentially of tungsten having from 5 to about 20 grains per square millimeter and a hardness on the Rockwell C scale from about 31 to about 35 is suited for armor penetration.
Inventors
- 👤 James A. Mullendore
- 👤 Scott K. Reiman
- 👤 Andrew J. Kegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:27
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/24; C; C22; C22F; C22F1/00; C22F1/16; C22F1/18; F; F42; F42B; F42B12/00; F42B12/02; F42B12/04; F42B12/06; F42B12/72; F42B12/74
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
38 words
A penetrator for armor consisting essentially of a body of tungsten having from about 5 to about 20 grains per square millimeter and a hardness of from about 31 to about 35 on the Rockwell C hardness scale.
Claim 2
Dependent Claim
38 words
A penetrator for armor consisting essentially of a body of tungsten having from about 5 to about 20 grains per square millimeter and a hardness of from about 31 to about 35 on the Rockwell C hardness scale.
Claim 3
Dependent Claim
28 words
A penetrator according to claim 1 wherein a rear portion constituting from about 10% to about 35% of the total length is in an unannealed and unrecrystallized state.
Claim 4
Dependent Claim
162 words
A process for producing a frangible tungsten product comprising (a) pressing tungsten powder having an average grain size of from about 1 to about 25 microns to form a bar of a predetermined cross-sectional area, (b) sintering said bar in a non oxidizing atmosphere at a temperature of from about 2700° C. to about 2900° C. for a sufficient time to attain a density in said bar of from about 17.3 g/cm 3 to about 18.1 g/cm 3 , (c) elongating said bar to achieve about 30% to about 40% reduction in cross-sectional area, (d) machining the resulting bar to form penetrators of predetermined shape, and (e) annealing at least a portion of said penetrator at a temperature of from about 1700° C. to about 1900° C. for a sufficient time to achieve a material having from about 5 to about 20 grains per square millimeter, and a hardness measuring from about 31 to about 35 on the Rockwell C hardness scale.
Claim 5
Dependent Claim
162 words
A process for producing a frangible tungsten product comprising (a) pressing tungsten powder having an average grain size of from about 1 to about 25 microns to form a bar of a predetermined cross-sectional area, (b) sintering said bar in a non oxidizing atmosphere at a temperature of from about 2700° C. to about 2900° C. for a sufficient time to attain a density in said bar of from about 17.3 g/cm 3 to about 18.1 g/cm 3 , (c) elongating said bar to achieve about 30% to about 40% reduction in cross-sectional area, (d) machining the resulting bar to form penetrators of predetermined shape, and (e) annealing at least a portion of said penetrator at a temperature of from about 1700° C. to about 1900° C. for a sufficient time to achieve a material having from about 5 to about 20 grains per square millimeter, and a hardness measuring from about 31 to about 35 on the Rockwell C hardness scale.
Claim 6
Dependent Claim
13 words
A process according to claim 3 wherein all of said penetrator is annealed.
Claim 7
Dependent Claim
23 words
A process according to claim 3 wherein a rear portion constituting from about 10% to about 35% of the total length is unannealed.
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) | 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 |