Patent US3956989A successfully refreshed from Google Patents.
US3956989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fragmentation device
Assignee: United States Department of the Army
•
Filing: 1966-12-08
•
Granted: 1976-05-18
•
Expires: 1986-12-08
Abstract
Abstract A high explosive device with improved fragmentation is provided with a wall of wrought steel having a ferrite-martensite microstructure. This is obtained by heating in a temperature range in the ferrite-austenite region of the iron-carbon phase diagram until equilibrium is established between the two phases, and then quenching to retain the ferrite and transform the austenitic phase to martensite for said microstructure.
Inventors
- 👤 Charles E. Sallade
- 👤 James D. Nicolo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:04
CPC Classifications
F; F42; F42B; F42B12/00; F42B12/72; F42B12/76; C; C21; C21D; C21D9/00; C21D9/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A high explosive device of the projectile type having a wall of wrought steel of hypoeutectoid composition consisting exclusively of a discontinuous, balanced ferrite-untempered martensite microstructure for improved fragmentation effects.
Claim 2
Dependent Claim
30 words
A high explosive device of the projectile type having a wall of wrought steel of hypoeutectoid composition consisting exclusively of a discontinuous, balanced ferrite-untempered martensite microstructure for improved fragmentation effects.
References Cited (Backward Citations)
US2044780A
Cited
US1985456A
Cited
US2411862A
Cited
US2805466A
Cited
US2789928A
Cited
US2763545A
Cited
US3378367A
Cited
US3117041A
Cited
US3288657A
Cited
US3178324A
Cited
US3271207A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |