US3322530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for adding additives to molten steel
Assignee: IHI Corp
•
Filing: 1963-08-23
•
Granted: 1967-05-30
•
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 07:51
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
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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) | 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 |