Patent EP0164601A2 successfully refreshed from Google Patents.
US2937084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of high-grade cast-iron
Assignee: Voestalpine AG
•
Filing: 1957-11-18
•
Granted: 1960-05-17
•
Expires: 1977-11-18
Abstract
No abstract record available.
Inventors
- 👤 Klepp Fritz
- 👤 Werner Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:44
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A PROCESS FOR THE PRODUCTION OF SPHEROIDAL GRAPHITE CAST-IRON COMPRISING PROVIDING A MOLTEN IRON BATH CONTAINING SILICON AND PHOSPHOROUS, SAID BATH BEING PRODUCED BY MELTING A NORMAL CHARGE IN AN ACID CUPOLA FURNACE, BLOWING SAID BATH WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF OXYGEN AND OXYGEN-ENRICHED GAS IN THE PRESENCE OF A BASIC SLAG TO INCREASE THE TEMPERATURE OF THE BATH AND TO REDUCE THE SILICON CONTENT TO LESS THAN 1%, REDUCING THE PHOSPHOROUS CONTENT DURING BLOWING BY INTRODUCING INTO SAID BATH FINELY DIVIDED MATERIAL CONTAINING IRON OXIDE, CALCIUM OXIDE AND SODIUM CARBONATE, AND ADDING TO SAID BATH SILICON-CONTAINING MATERIALS WHICH CAUSE THE FORMATION OF A SPHEROIDAL GRAPHITE STRUCTURE DURING SOLIDIFICATION OF THE BATH.
Claim 2
Dependent Claim
116 words
A PROCESS FOR THE PRODUCTION OF SPHEROIDAL GRAPHITE CAST-IRON COMPRISING PROVIDING A MOLTEN IRON BATH CONTAINING SILICON AND PHOSPHOROUS, SAID BATH BEING PRODUCED BY MELTING A NORMAL CHARGE IN AN ACID CUPOLA FURNACE, BLOWING SAID BATH WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF OXYGEN AND OXYGEN-ENRICHED GAS IN THE PRESENCE OF A BASIC SLAG TO INCREASE THE TEMPERATURE OF THE BATH AND TO REDUCE THE SILICON CONTENT TO LESS THAN 1%, REDUCING THE PHOSPHOROUS CONTENT DURING BLOWING BY INTRODUCING INTO SAID BATH FINELY DIVIDED MATERIAL CONTAINING IRON OXIDE, CALCIUM OXIDE AND SODIUM CARBONATE, AND ADDING TO SAID BATH SILICON-CONTAINING MATERIALS WHICH CAUSE THE FORMATION OF A SPHEROIDAL GRAPHITE STRUCTURE DURING SOLIDIFICATION OF THE BATH.
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) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |