US3304174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low oxygen-silicon base addition alloys for iron and steel refining
Assignee: Research Institute for Iron Steel and Other Metals of Tohoku University
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Filing: 1964-08-17
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Granted: 1967-02-14
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Expires: 1984-08-17
Abstract
No abstract record available.
Inventors
- 👤 Ototani Tohei
- 👤 Maruyama Masuteru
- 👤 Morooka Yasuhiko
- 👤 Matsumoto Jiro
- 👤 Izumi Sumio
- 👤 Kashiwabara Koyo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:30
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/0006; C22; C22C; C22C28/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
LOW OXYGEN-SILICON BASE ADDITION ALLOYS FOR REFINING IRON AND STEEL CONSISTING ESSENTIALLY OF 50 TO 97% SILICON, 0.1 TO 30% MANGANESE, 0.1 TO 10% CALCIUM AND THE REMAINDER IRON, THE OXYGEN CONTENT BEING LESS THAN 0.04%.
Claim 2
Dependent Claim
36 words
LOW OXYGEN-SILICON BASE ADDITION ALLOYS FOR REFINING IRON AND STEEL CONSISTING ESSENTIALLY OF 50 TO 97% SILICON, 0.1 TO 30% MANGANESE, 0.1 TO 10% CALCIUM AND THE REMAINDER IRON, THE OXYGEN CONTENT BEING LESS THAN 0.04%.
References Cited (Backward Citations)
US2950187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |