US3301663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steel making processes
Assignee: Dortmund Hoerder Huettenunion AG
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Filing: 1964-04-23
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Granted: 1967-01-31
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Expires: 1984-04-23
Abstract
No abstract record available.
Inventors
- 👤 Wicher Adalbert
- 👤 Pape Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:16
CPC Classifications
C; C22; C22C; C22C35/00; C21; C21C; C21C7/00; C21C7/04; C21C7/06; C22C28/00; C22C38/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR THE MANUFACTURE OF STEELS CONTAINING A FINE DISTRUBUTION OF NONMETALLIC INCLUSIONS AND HAVING GOOD CUTTING PROPERTIES OVER A WIDE RANGE OF CUTTING SPEEDS, WHICH COMPRISES PROVIDING THE STEEL WITH AN OXYGEN CONTENT OF 0.004 TO 0.1%, DEOXIDIZING THE STEEL IN THE MOLTEN STATE WITH A FERRO-ALLOY CONTAINING 45 TO 90% OF SILICON, 0.5 TO 40% OF CALCIUM, UP TO 4% OF ALUMINUM. 0.5 TO 8% OF MANGANESE AND REMAINDER IRON IN ADDITION TO IMPURITIES WHEREBY A PROTECTIVE LAYER OF OXIDIZED INCLUSIONS WILL BE FORMED ON A TOOL CUTTING THE STEEL
Claim 2
Dependent Claim
93 words
A PROCESS FOR THE MANUFACTURE OF STEELS CONTAINING A FINE DISTRUBUTION OF NONMETALLIC INCLUSIONS AND HAVING GOOD CUTTING PROPERTIES OVER A WIDE RANGE OF CUTTING SPEEDS, WHICH COMPRISES PROVIDING THE STEEL WITH AN OXYGEN CONTENT OF 0.004 TO 0.1%, DEOXIDIZING THE STEEL IN THE MOLTEN STATE WITH A FERRO-ALLOY CONTAINING 45 TO 90% OF SILICON, 0.5 TO 40% OF CALCIUM, UP TO 4% OF ALUMINUM. 0.5 TO 8% OF MANGANESE AND REMAINDER IRON IN ADDITION TO IMPURITIES WHEREBY A PROTECTIVE LAYER OF OXIDIZED INCLUSIONS WILL BE FORMED ON A TOOL CUTTING THE STEEL
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) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |