US3607247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes for the oxygen converter production of stainless steels
Assignee: Crucible Materials Corp
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Filing: 1968-11-12
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Granted: 1971-09-21
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Expires: 1988-11-12
Abstract
Abstract A channel furnace is used to mix chromium-containing and chromium-free hot metals, producing a converter feed metal of desired temperature and chemical composition. Weighed charges of such feed metal are blown in the converter. This makes practical the production of stainless steel from ore without use of an electric furnace. The time and the electricity saved yield cost savings.
Inventors
- 👤 Clifford W Mccoy
- 👤 Eugene L Kern
- 👤 George A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:51
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/30; C21C5/32; C21C5/005; Y; Y10; Y10S; Y10S266/00; Y10S266/90
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
The process of claim 1 characterized in that the preparing of said feed charge is characterized by the steps of withdrawing successive aliquots of molten impure chromium-coating ferrous material from a combustion furnace, placing said aliquots in a container having a capacity sufficient to hold at least three such aliquots and mixing in said container said aliquots to minimize the effect of chemical variations thereof from a desired value while heating the material in said container.
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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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |