Patent EP0402296A1 successfully refreshed from Google Patents.
Patent JPS5595320A successfully refreshed from Google Patents.
US2895820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of reducing iron ores and carburizing under vacuum
Assignee: Dortmund Hoerder Huettenunion AG
•
Filing: 1957-10-29
•
Granted: 1959-07-21
•
Expires: 1977-10-29
Abstract
No abstract record available.
Inventors
- 👤 Harders Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:46
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0006; C21B13/0013; C21C; C21C7/00; C21C7/0025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
THE PROCESS OF REDUCING IRON ORE, WHICH COMPRISES DELIVERING THE ORE AND ADDITIONAL MATERIALS TO AN IRON MELT, SUCKING THE IRON MELT IN PORTIONS INTO AN EVACUATED VESSEL, CARBURIZING THE MELT IN THE VESSEL AND RETURNING THE CARBURIZED PORTIONS TO THE IRON MELT.
Claim 2
Dependent Claim
43 words
THE PROCESS OF REDUCING IRON ORE, WHICH COMPRISES DELIVERING THE ORE AND ADDITIONAL MATERIALS TO AN IRON MELT, SUCKING THE IRON MELT IN PORTIONS INTO AN EVACUATED VESSEL, CARBURIZING THE MELT IN THE VESSEL AND RETURNING THE CARBURIZED PORTIONS TO THE IRON MELT.
References Cited (Backward Citations)
US1921060A
Cited
US2054923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-07-20 | 1963-01-19 | 1963-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-20 | 1967-01-19 | 1967-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-20 | 1971-01-19 | 1971-07-21 | $7700.00 | Window Closed / Lapsed |