US3994752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annealing treatment for controlling warhead fragmentation size distribution
Assignee: United States Department of the Navy
•
Filing: 1973-10-23
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Granted: 1976-11-30
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Expires: 1993-10-23
Abstract
Abstract Methods for controlling the sizes and shapes of fragments produced by warhead casings are disclosed.
Inventors
- 👤 George A. Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:49
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/04; C21; C21D; C21D9/00; C21D9/16; F; F42; F42B; F42B12/00; F42B12/02; F42B12/20; F42B12/22; F42B12/72; F42B12/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A method for controlling the size and shape of fragments produced by a steel warhead casing having the nominal composition 1.1% C, 1.8% Mn, 0.009% P, 0.82% Si, 0.015% S, 0.01% Al and a balance of Fe wherein the percentages are by weight, said method comprising the steps of: a. heating said casing to austenitizing temperature of about 1,750° F b. oil quenching said casing to a temperature within the range of from 250° F to 150° F; c. masking said casing with a plastic cover which leaves a first gridwork of bare metal exposed; d. coating said first grid work of bare metal with copper; e. removing said plastic cover to expose a second gridwork of non-coated bare metal; f. subjecting said casing to a carburizing atmosphere sufficient to produce a carburized gridwork which is more brittle than the copper coated gridwork; and g. air cooling said casing to room temperature.
Claim 2
Independent Claim
152 words
A method for controlling the size and shape of fragments produced by a steel warhead casing having the nominal composition 1.1% C, 1.8% Mn, 0.009% P, 0.82% Si, 0.015% S, 0.01% Al and a balance of Fe wherein the percentages are by weight, said method comprising the steps of: a. heating said casing to austenitizing temperature of about 1,750° F b. oil quenching said casing to a temperature within the range of from 250° F to 150° F; c. masking said casing with a plastic cover which leaves a first gridwork of bare metal exposed; d. coating said first grid work of bare metal with copper; e. removing said plastic cover to expose a second gridwork of non-coated bare metal; f. subjecting said casing to a carburizing atmosphere sufficient to produce a carburized gridwork which is more brittle than the copper coated gridwork; and g. air cooling said casing to room temperature.
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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) | 1979-11-30 | 1980-05-31 | 1980-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-30 | 1984-05-31 | 1984-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-30 | 1988-05-31 | 1988-11-30 | $7700.00 | Window Closed / Lapsed |