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Patent US4730925A successfully refreshed from Google Patents.
US4730925A
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Method of spectroscopically determining the composition of molten iron
Assignee: Nippon Steel Corp
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Filing: 1986-09-09
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Granted: 1988-03-15
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Expires: 2006-09-09
Abstract
Abstract Oxygen or a mixed gas containing oxygen, or a chemical flame produced by a mixture of a combustion gas and a combustion-assisting gas containing oxygen, is blown against the surface of molten iron to cause radiation emission. The radiations are divided into components of different wavelengths, and the resulting emission spectra are measured to determine the composition of the molten iron.
Inventors
- 👤 Koichi Chiba
- 👤 Akihiro Ono
- 👤 Takamasa Ohno
- 👤 Masaki Okajima
- 👤 Hiroshi Yamane
- 👤 Minoru Hayata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 07:19
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/71; G01N21/72
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
45 words
A method of spectroscopically determining the composition of molten iron which comprises the steps of producing a hot spot by blowing oxygen or an oxygen-containing mixed gas against the surface of the molten iron and measuring the spectra of radiations emitted from the hot spot.
Claim 2
Independent Claim
45 words
A method of spectroscopically determining the composition of molten iron which comprises the steps of producing a hot spot by blowing oxygen or an oxygen-containing mixed gas against the surface of the molten iron and measuring the spectra of radiations emitted from the hot spot.
Claim 3
Dependent Claim
32 words
A method of spectroscopically determining the composition of molten iron according to claim 1, in which the radiations from the hot spot are transmitted to a spectrometer for analysis through optical fibers.
Claim 4
Dependent Claim
46 words
A method of spectroscopically determining the composition of molten iron according to claim 2, in which the optical fibers are provided in a lance through which oxygen or an oxygen-containing mixed gas is blown, the tip of the optical fibers being directed toward the hot spot.
Claim 5
Dependent Claim
34 words
A method of spectroscopically determining the composition of molten iron according to claim 1, in which the radiations from the hot spot are transmitted to a spectrometer for analysis through a set of lenses.
Claim 6
Dependent Claim
26 words
A method of spectroscopically determining the composition of molten iron according to claim 1, in which the molten iron is contained in a basic oxygen converter.
Claim 7
Independent Claim
59 words
A method of spectroscopically determining the composition of molten iron which comprises the steps of heating a localized area in the surface of molten iron with a chemical flame blown thereagainst, the chemical flame being produced by a mixture of a combustion gas and a combustion-assisting gas, and measuring the spectra of radiations emitted from the locally heated area.
Claim 8
Independent Claim
59 words
A method of spectroscopically determining the composition of molten iron which comprises the steps of heating a localized area in the surface of molten iron with a chemical flame blown thereagainst, the chemical flame being produced by a mixture of a combustion gas and a combustion-assisting gas, and measuring the spectra of radiations emitted from the locally heated area.
Claim 9
Dependent Claim
33 words
A method of spectroscopically determining the composition of molten iron according to claim 6, in which the radiations from the locally heated area are transmitted to a spectrometer for analysis through optical fibers.
Claim 10
Dependent Claim
44 words
A method of spectroscopically determining the composition of molten iron according to claim 7, in which the optical fibers are provided in a lance through which a chemical flame is blown, the tip of the optical fibers being directed toward the locally heated area.
Claim 11
Dependent Claim
35 words
A method of spectroscopically determining the composition of molten iron according to claim 6, in which the radiations from the locally heated area are transmitted to a spectrometer for analysis through a set of lenses.
References Cited (Backward Citations)
GB1116052A
Cited
JPS56145336A
Cited
JPS58102137A
Cited
JPS59157541A
Cited
JPS60162944A
Cited
JPS60162943A
Cited
JPS60162945A
Cited
JPS60219538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |