US3676907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Naturally fragmenting projectiles of aisi 06 steel
Assignee: United States Department of the Navy
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Filing: 1966-02-18
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Granted: 1972-07-18
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Expires: 1986-02-18
Abstract
Abstract A method of making a mortar shell of AISI 06 steel, and the product produced thereby, comprising forging the steel to a rough shape, rough machining the forged article, heat treating said article to approximately 1,750* F for approximately 2 hours, aircooling said article, tempering said article at approximately 500* F for approximately 1 hour and finish machining said article to completion.
Inventors
- 👤 Sigfred F Magis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:02
CPC Classifications
B; B21; B21K; B21K21/00; B21K21/06; C; 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
109 words
A method of producing a high capacity explosive shell casing of AISI 06 steel having a mixed microstructure which upon explosion of the shell will produce fragments of 4-11 grains-m comprising the steps of: forging said shell casing into a desired rough shape; rough machining said shell casing to within close tolerances of its desired finished shape; normalizing said shell casing by heating at approximately 1,750* F for a period of about 2 hours; air cooling said shell casing; tempering said shell casing by heating at approximately 500* F for a period of about 1 hour; whereby said mixed microstructure is produced; and then finish machining said shell casing.
Claim 2
Independent Claim
109 words
A method of producing a high capacity explosive shell casing of AISI 06 steel having a mixed microstructure which upon explosion of the shell will produce fragments of 4-11 grains-m comprising the steps of: forging said shell casing into a desired rough shape; rough machining said shell casing to within close tolerances of its desired finished shape; normalizing said shell casing by heating at approximately 1,750* F for a period of about 2 hours; air cooling said shell casing; tempering said shell casing by heating at approximately 500* F for a period of about 1 hour; whereby said mixed microstructure is produced; and then finish machining said shell casing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |