Patent US3322530A successfully refreshed from Google Patents.
US3322530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for adding additives to molten steel
Assignee: IHI Corp
•
Filing: 1963-08-23
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Granted: 1967-05-30
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Expires: 1983-08-23
Abstract
No abstract record available.
Inventors
- 👤 Nakamura Hajime
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:05
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/0056; C21C7/04; C21C7/06; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12097; Y10T428/12222; Y10T428/12493; Y10T428/12986
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A METHOD COMPRISING ADDING A NITROGEN ENRICHMENT AGENT TO MOLTEN STEEL WHICH IS BEING TAPPED INTO A RECEPTACLE AND WHICH THEREBY HAS A CONTINUOUSLY RISING SURFACE BY SUPPLYING THE AGENT TO THE MOLTEN STEEL BY A CONSUMABLE PIPE WHICH IS PLACED IN SAID STEEL AND IS CONSUMED BY THE STEEL AT A RATE TO SUPPLY SAID AGENT THERETO AT A LOWER
Claim 2
Independent Claim
61 words
A METHOD COMPRISING ADDING A NITROGEN ENRICHMENT AGENT TO MOLTEN STEEL WHICH IS BEING TAPPED INTO A RECEPTACLE AND WHICH THEREBY HAS A CONTINUOUSLY RISING SURFACE BY SUPPLYING THE AGENT TO THE MOLTEN STEEL BY A CONSUMABLE PIPE WHICH IS PLACED IN SAID STEEL AND IS CONSUMED BY THE STEEL AT A RATE TO SUPPLY SAID AGENT THERETO AT A LOWER
References Cited (Backward Citations)
US1335370A
Cited
US2085802A
Cited
US2370364A
Cited
US2662008A
Cited
US2705196A
Cited
US2747990A
Cited
US2918365A
Cited
US2915386A
Cited
GB785551A
Cited
US2879156A
Cited
GB874181A
Cited
US3056190A
Cited
US3080228A
Cited
US3208117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-29 | 1970-11-28 | 1971-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-29 | 1974-11-28 | 1975-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-29 | 1978-11-28 | 1979-05-30 | $7700.00 | Window Closed / Lapsed |