Patent US3615380A successfully refreshed from Google Patents.
US3615380A
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US
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Sintered nitrogen-containing key steel refining alloy
Assignee: ELEKTROMELALLURGIE MBH GES
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Filing: 1968-05-14
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Granted: 1971-10-26
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Expires: 1988-05-14
Abstract
Abstract A useful method of making key alloys for refining steel by addition to the steel melt whereby alloying elements and nitrogen may be incorporated in the steel, consists of nitriding a nitridable metal or metal alloy, which alloy may be an alloy of two nitridable alloys or a ferroalloy of a nitridable metal, by exposing the metal or alloy to a nitriding atmosphere at an elevated temperature.
Inventors
- 👤 Rudolf Fichte
- 👤 Hans Franke
- 👤 Hans-Joachim Retelsdorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:55
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/24; C23C8/26; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
29 words
A method according to claim 1, in which the said mixture is a mixture of a manganese substance selected from the class consisting of manganese and ferromanganese, and ferrovanadium.
Claim 2
Dependent Claim
22 words
A method according to claim 2, in which the ratio by weight of manganese substance to ferrovanadium is between 3:1 and 1:1.
Claim 3
Dependent Claim
40 words
A method according to claim 1, in which the said mixture is a mixture of a manganese substance selected from the class consisting of manganese and ferromanganese, and a chromium substance selected from the class consisting of chromium and ferrochromium.
Claim 4
Dependent Claim
23 words
A method according to claim 4, in which the ratio by weight of manganese substance to chromium substance is between 3:1 and 1:2.
Claim 5
Dependent Claim
29 words
A method according to claim 1, in which the said mixture is a mixture of ferrovanadium and a chromium substance selected from the class consisting of chromium and ferrochromium.
Claim 6
Dependent Claim
22 words
A method according to claim 6, in which the ratio by weight of ferrovanadium to chromium substance is between 2:1 and 1:3.
Claim 7
Dependent Claim
29 words
A method according to claim 1, in which the said mixture is a mixture of a manganese substance selected from the class consisting of manganese and ferromanganese, and ferroniobium.
Claim 8
Dependent Claim
22 words
A method according to claim 8, in which the ratio by weight of manganese substance to ferroniobium is between 4:1 and 1:1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |