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US4374667A
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Ferrovanadium carbide addition agents and process for their production
Assignee: Reading Alloys Inc
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Filing: 1981-10-14
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Granted: 1983-02-22
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Expires: 2001-10-14
Abstract
Abstract Ferrovanadium carbide addition agents comprising 75 to 85% vanadium, 8 to 12% carbon, 8 to 12% iron, less than 2% oxygen and having a density of from about 5.8 to about 6.2. The addition agents are produced by fusing vanadium oxide, iron and carbon at about 1700° C. to about 2100° C.
Inventors
- 👤 Frederick H. Perfect
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:33
CPC Classifications
C; C22; C22C; C22C35/00; C22C35/005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
33 words
A ferrovanadium carbide addition agent comprising 75 to 85% vanadium, 8 to 12% carbon, 8 to 12% iron, less than 2% oxygen and having a density of from about 5.8 to about 6.2.
Claim 2
Dependent Claim
33 words
A ferrovanadium carbide addition agent comprising 75 to 85% vanadium, 8 to 12% carbon, 8 to 12% iron, less than 2% oxygen and having a density of from about 5.8 to about 6.2.
Claim 3
Dependent Claim
26 words
The ferrovanadium carbide addition agent of claim 1 comprising 78 to 82% vanadium, 9 to 11% carbon, 9 to 11% iron and less than 1% oxygen.
Claim 4
Dependent Claim
83 words
A process for preparing ferrovanadium carbide addition agents having a density of from about 5.8 to 6.2 comprising mixing and combining (a) vanadium oxide, (b) iron and (c) carbon, fusing the combined material at about 1700° C. to about 2100° C. at atmospheric pressure under a reducing atmosphere, the proportional relationship between (a), (b) and (c) being such that the ferrovanadium carbide addition agent recovered comprises 75 to 85% vanadium, 8 to 12% carbon, 8 to 12% iron and less than 2% oxygen.
Claim 5
Dependent Claim
83 words
A process for preparing ferrovanadium carbide addition agents having a density of from about 5.8 to 6.2 comprising mixing and combining (a) vanadium oxide, (b) iron and (c) carbon, fusing the combined material at about 1700° C. to about 2100° C. at atmospheric pressure under a reducing atmosphere, the proportional relationship between (a), (b) and (c) being such that the ferrovanadium carbide addition agent recovered comprises 75 to 85% vanadium, 8 to 12% carbon, 8 to 12% iron and less than 2% oxygen.
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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) | 1986-02-21 | 1986-08-23 | 1987-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-21 | 1990-08-23 | 1991-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-21 | 1994-08-23 | 1995-02-22 | $7700.00 | Window Closed / Lapsed |