Patent US3039902A successfully refreshed from Google Patents.
US3039902A
Expired / Lapsed
US
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Method of treating steel
Assignee: Allegheny Ludlum Steel Corp
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Filing: 1958-04-15
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Granted: 1962-06-19
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Expires: 1978-04-15
Abstract
No abstract record available.
Inventors
- 👤 Jr Clarence L Miller
- 👤 Paul E Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:47
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14775; H01F1/14783; C; C21; C21D; C21D3/00; C21D3/02; C21D8/00; C21D8/12; C21D8/1277; C21D8/1283; C21D8/1244; C21D8/1255
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
IN THE PROCESS OF MAKING MAGNETIC MATERIALS WHEREIN HOT FLAT ROLLED SILICON GRADES OF ELECTRICAL STEEL THAT CONTAIN FROM 1% TO 4% SILICON ARE ALTERNATELY COLD ROLLED AND HEAT TREATED TO OBTAINED (100) (110) CUBE ON EDGE CRYSTAL ORIENTATION PARALLEL TO THE DIRECTION OF ROLLING AND WHICH ARE HELD AT ELEVATED TEMPERATURE IN A SUBSTANTIALLY NON-OXIDIZING ATMOSPHERE TO LOWER THE SULFUR CONTENT OF SAID STEEL, THE IMPROVEMENT ION COMBINATION THEREWITH OF ACCELERATING THE LOWERING OF SAID SULFUR CONTENT BY SUBSTANTIALLY UNIFORMLY COATING SAID COLD ROLLED STEEL WITH FROM ABOUT .02 OUNCE PER SQUARE FOOT TO ABOUT .07 OUNCE FROM ABOUT .02 OUNCE PER SQUARE FOOT TO ABOUT .07 OUNCE GROUP CONSISTING OF CALCIUM CARBONATE, LITHIUM CARBONATE, SODIUM NITRATE AND POTASSIUM NITRATE AND SUBJECTING SAID COATED COLD FOLLED STEEL TO A TEMPERATURE OF FROM 2000*F. TO 2250F. IN A SUBSTANTIALLY NON-OXIDIZING ATMOSPHERE FOR AN EFFECTIVE TIME OF UP TO BUT NOT INCLUDING ONE HOUR.
Claim 2
Dependent Claim
153 words
IN THE PROCESS OF MAKING MAGNETIC MATERIALS WHEREIN HOT FLAT ROLLED SILICON GRADES OF ELECTRICAL STEEL THAT CONTAIN FROM 1% TO 4% SILICON ARE ALTERNATELY COLD ROLLED AND HEAT TREATED TO OBTAINED (100) (110) CUBE ON EDGE CRYSTAL ORIENTATION PARALLEL TO THE DIRECTION OF ROLLING AND WHICH ARE HELD AT ELEVATED TEMPERATURE IN A SUBSTANTIALLY NON-OXIDIZING ATMOSPHERE TO LOWER THE SULFUR CONTENT OF SAID STEEL, THE IMPROVEMENT ION COMBINATION THEREWITH OF ACCELERATING THE LOWERING OF SAID SULFUR CONTENT BY SUBSTANTIALLY UNIFORMLY COATING SAID COLD ROLLED STEEL WITH FROM ABOUT .02 OUNCE PER SQUARE FOOT TO ABOUT .07 OUNCE FROM ABOUT .02 OUNCE PER SQUARE FOOT TO ABOUT .07 OUNCE GROUP CONSISTING OF CALCIUM CARBONATE, LITHIUM CARBONATE, SODIUM NITRATE AND POTASSIUM NITRATE AND SUBJECTING SAID COATED COLD FOLLED STEEL TO A TEMPERATURE OF FROM 2000*F. TO 2250F. IN A SUBSTANTIALLY NON-OXIDIZING ATMOSPHERE FOR AN EFFECTIVE TIME OF UP TO BUT NOT INCLUDING ONE HOUR.
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) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |