US2968092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of working steel for preventing surface defects thereof
Assignee: Yawata Iron and Steel Co Ltd
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Filing: 1957-02-12
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Granted: 1961-01-17
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Expires: 1977-02-12
Abstract
No abstract record available.
Inventors
- 👤 Ohtake Tadashi
- 👤 Ishizaki Keizo
- 👤 Eguchi Naoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:56
CPC Classifications
B; B21; B21B; B21B45/00; C; C21; C21D; C21D1/00; C21D1/68; Y; Y10; Y10S; Y10S72/00; Y10S72/70; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981; Y10T29/49812
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IN HOT-WORKING A STEEL CONTAINING AS IMPURITY A MEMBER SELECTED FROM THE GROUP CONSISTING OF COPPER+TIN+ ARSENIC AND COPPER+TIN, THE IMPROVEMENT WHICH COMPRISES, IN COMBINATON, APPLYING TO THE BARE SURFACE OF THE AFORSAID STEEL A MATERIAL CONSISTING ESSENTIALLY OF AN AGENT SELECTED FROM THE GROUP CONSISTING OF IRON SULFIDE, SODIUM SULFIDE, POTASSIUM SULFIDE, ALUMINUM SULFIDE, MIXTURES OF THESE SULFIDES WITH ONE ANOTHER AND MIXTURES OF THESE SULFIDES WITH IRON OXIDE AND HOT-WORKING THE RESULTING STEEL AT A TEMPERATURE AT WHICH THE APPLIED AGENT IS IN MOLTEN STATE, SAID AGENT BEING APPLEID IN AN AMOUNT PER UNIT AREA OF SAID SURFACE WHICH IS SUBSTANTIALLY THE SAME AS THE AMOUNT OF ALLOY OF IRON FROM THE STEEL AND SAID INPURITY PRESENT ON SAID SURFACE PER UNIT AREA IN LIQUID PHASE DURING THE HOT-WORKING STEP.
Claim 2
Dependent Claim
132 words
IN HOT-WORKING A STEEL CONTAINING AS IMPURITY A MEMBER SELECTED FROM THE GROUP CONSISTING OF COPPER+TIN+ ARSENIC AND COPPER+TIN, THE IMPROVEMENT WHICH COMPRISES, IN COMBINATON, APPLYING TO THE BARE SURFACE OF THE AFORSAID STEEL A MATERIAL CONSISTING ESSENTIALLY OF AN AGENT SELECTED FROM THE GROUP CONSISTING OF IRON SULFIDE, SODIUM SULFIDE, POTASSIUM SULFIDE, ALUMINUM SULFIDE, MIXTURES OF THESE SULFIDES WITH ONE ANOTHER AND MIXTURES OF THESE SULFIDES WITH IRON OXIDE AND HOT-WORKING THE RESULTING STEEL AT A TEMPERATURE AT WHICH THE APPLIED AGENT IS IN MOLTEN STATE, SAID AGENT BEING APPLEID IN AN AMOUNT PER UNIT AREA OF SAID SURFACE WHICH IS SUBSTANTIALLY THE SAME AS THE AMOUNT OF ALLOY OF IRON FROM THE STEEL AND SAID INPURITY PRESENT ON SAID SURFACE PER UNIT AREA IN LIQUID PHASE DURING THE HOT-WORKING STEP.
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) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |