US2950187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron-calcium base alloy
Assignee: OTHER METALS OF TOHOKU UNI
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Filing: 1958-09-05
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Granted: 1960-08-23
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Expires: 1978-09-05
Abstract
No abstract record available.
Inventors
- 👤 Ototani Tohei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:19
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/06; C22; C22C; C22C38/00; C22C38/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
AN IRON-CALCIUM BASE ALLOY TO BE ADDED TO THE MELT OF IRON AND STEEL FOR IMPROVING THE PHYSICAL AND CHEMICAL PROPERTIES OF IRON AND STEEL, WHICH CONSISTS OF 20 TO 40% OF CALCIUM, 10 TO 5% OF MANGANESE, 5 TO 40% OF SILICON AND A BALANCE ESSENTIALLY OF IRON.
Claim 2
Dependent Claim
49 words
AN IRON-CALCIUM BASE ALLOY TO BE ADDED TO THE MELT OF IRON AND STEEL FOR IMPROVING THE PHYSICAL AND CHEMICAL PROPERTIES OF IRON AND STEEL, WHICH CONSISTS OF 20 TO 40% OF CALCIUM, 10 TO 5% OF MANGANESE, 5 TO 40% OF SILICON AND A BALANCE ESSENTIALLY OF IRON.
Claim 3
Dependent Claim
33 words
AN IRON-CALCIUM BASE ALLOY, WHICH CONSISTS OF 15 TO 30% OF CA, 10 TO 50% OF MN, 5 TO 20% OF AL, LESS THAN 20% OF SI AND A BALANCE ESSENTIALLY OF FE.
Claim 4
Dependent Claim
33 words
AN IRON-CALCIUM BASE ALLOY, WHICH CONSISTS OF 15 TO 30% OF CA, 10 TO 50% OF MN, 5 TO 20% OF AL, LESS THAN 20% OF SI AND A BALANCE ESSENTIALLY OF FE.
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) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |