US5733502A
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Ferroalloy for inoculation of spherulitic graphite irons
Assignee: Ferroglobe France SAS
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Filing: 1997-06-25
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Granted: 1998-03-31
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Expires: 2017-06-25
Abstract
Abstract A ferrosilicon-based ferroalloy for inoculation of spherulitic graphite irons containing (by weight) from 0.005% to 3% rare earths, 0.005% to 3% bismuth, lead and/or antimony, and 0.3% to 3% calcium, and is characterized by the fact that Si/Fe>2 and contains from 0.3 to 3% magnesium. The ferroalloy exhibits improved granulometric stability during storage.
Inventors
- 👤 Thomas Margaria
- 👤 Robert Herold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:55
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/10; C21C1/105; C22; C22C; C22C35/00; C22C35/005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
47 words
Ferrosilicon-based ferroalloy for inoculation of spherulitic graphite irons and containing (by weight) from 0.005% to 3% rare earths, 0.005% to 3% bismuth, lead and/or antimony, and 0.3 to 3% calcium, wherein the Si/Fe ratio was greater than 2 and wherein it contains from 0.3% to 3% magnesium.
Claim 2
Dependent Claim
47 words
Ferrosilicon-based ferroalloy for inoculation of spherulitic graphite irons and containing (by weight) from 0.005% to 3% rare earths, 0.005% to 3% bismuth, lead and/or antimony, and 0.3 to 3% calcium, wherein the Si/Fe ratio was greater than 2 and wherein it contains from 0.3% to 3% magnesium.
Claim 3
Dependent Claim
13 words
Ferroalloy according to claim 1, wherein the Si/Fe ratio is greater than 2.5.
Claim 4
Dependent Claim
13 words
Ferroalloy according to claim 1, wherein it contains from 0.5 to 2% calcium.
Claim 5
Dependent Claim
13 words
Ferroalloy according to claim 1, wherein it contains from 0.5 to 1.5% magnesium.
Claim 6
Dependent Claim
18 words
Ferroalloy according to claim 1, wherein it is added to the iron in the form of filled wire.
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) | 2001-03-30 | 2001-09-29 | 2002-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-30 | 2005-09-29 | 2006-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-30 | 2009-09-29 | 2010-03-31 | $7700.00 | Window Closed / Lapsed |