US3796563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing metal sheet and foil
Assignee: Bethlehem Steel Corp
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Filing: 1972-05-24
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Granted: 1974-03-12
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Expires: 1992-05-24
Abstract
Abstract An aqueous slurry of superconcentrated iron ore powder and a binder is continuously deposited on a supporting carrier, dried, and the resultant coating heated in a reducing atmosphere to about 1,500* to 2,100* F. for several minutes to partially reduce the oxygen content of the ore. The coating is then stripped from the carrier and rolled to provide a strip of increased density. The strip is open coiled and heat treated to completely reduce the oxygen content of the ore, as well as to sinter the strip, and rolled to final gauge. The strip is then annealed, which both softens and further sinters the strip, and finish rolled.
Inventors
- 👤 G Wieland
- 👤 E Rudzki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:55
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/001; B22F3/18; B22F5/00; B22F5/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
in step (g), said strip is heated to 1,500* to 2,100* F. for 4 to 6 hours, and
Claim 2
Dependent Claim
13 words
A method as recited in claim 1, in which said slurry is aqueous.
Claim 3
Independent Claim
197 words
A method of producing a strip of ferrous metal from a powder of iron ore, comprising: a. preparing a slurry comprising said powder and a thickening and binding means, b. depositing said slurry on a supporting carrier to provide a coating, c. drying said coating on said carrier, d. heating said coating, while still on said carrier, in a reducing atmosphere to a temperature within the range of 1, 500* to 2,100* F. for a period of time sufficient to partially reduce the oxygen content of said ore whereby at least about 10 percent of the iron is in a metallic state, the balance of said iron being combined as one or more oxides, as well as to cause the particles of said coating to cohere, e. removing the coating from the carrier to provide a formed layer, f. rolling said formed layer into a strip having a density of 3.8 to 7.3 gm./cc., g. open coiling the strip and heating it in a reducing atmosphere for a time sufficient to reduce the oxygen content of the strip to about 2 wt. percent max., and h. rolling the strip to increase its density to about 7.7 gm./cc.
Claim 4
Independent Claim
8 words
the method includes the additional step of annealing.
Claim 5
Dependent Claim
9 words
A method as recited in claim 3, in which:
Claim 6
Dependent Claim
14 words
A method as recited in claim 4, in which said iron ore is superconcentrated.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |