US2804385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of refining phosphorus containing pig iron
Assignee: Huettenwerk Oberhausen AG
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Filing: 1954-11-03
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Granted: 1957-08-27
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Expires: 1974-11-03
Abstract
No abstract record available.
Inventors
- 👤 Rudolf F Graef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:15
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; Y; Y10; Y10S; Y10S75/00; Y10S75/958
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A METHOD OF REFINING PHOSPHORUS CONTAINING PIG IRON BY THE BASIC BESSEMER PROCESS IN A REACTION CHAMBER WHICH IS ROTABLE ABOUT A SUBSTANTIALLY HORIZONTAL AXIS, WHICH INCLUDES THE STEPS OF: PLACING THE MELT TO BE REFINED AND COMPOSED OF A PIG IRON METAL BATH AND A SLAG OBTAINED AS SECOND SLAG FROM A PRECEDING REFINING PROCESS INTO SAID REACTION CHAMBER, INTRODUCING A BLAST INTO SAID METAL BATH BELOW THE SLAG THEREON WHILE ROTATING SAID REACTION CHAMBER, DRAWING OFF SAID SLAG WHEN THE CITRICACID SOLUBILITY OF THE PHOSPHORIC ACID IN SAID SLAG HAS SUBSTANTIALLY REACHED ITS MAXIMIUM VALUE, FORMING A SECOND SLAG BY ADDING TO SAID BATH IN SAID CHAMBER LIME IN A QUANTITY APPROXIMATELY EQUALING FOUR TIMES THE WEIGHT OF THE PHOSPHORUS CONTAINED IN THE NEXT BATCH OF PIG IRON TO BE REFINED FOR USE AS FIRST SLAG WITH SAID NEXT BATCH, AND THEN FINISHING THE REFINING PROCESS IN SAID REACTION CHAMBER.
Claim 2
Independent Claim
152 words
A METHOD OF REFINING PHOSPHORUS CONTAINING PIG IRON BY THE BASIC BESSEMER PROCESS IN A REACTION CHAMBER WHICH IS ROTABLE ABOUT A SUBSTANTIALLY HORIZONTAL AXIS, WHICH INCLUDES THE STEPS OF: PLACING THE MELT TO BE REFINED AND COMPOSED OF A PIG IRON METAL BATH AND A SLAG OBTAINED AS SECOND SLAG FROM A PRECEDING REFINING PROCESS INTO SAID REACTION CHAMBER, INTRODUCING A BLAST INTO SAID METAL BATH BELOW THE SLAG THEREON WHILE ROTATING SAID REACTION CHAMBER, DRAWING OFF SAID SLAG WHEN THE CITRICACID SOLUBILITY OF THE PHOSPHORIC ACID IN SAID SLAG HAS SUBSTANTIALLY REACHED ITS MAXIMIUM VALUE, FORMING A SECOND SLAG BY ADDING TO SAID BATH IN SAID CHAMBER LIME IN A QUANTITY APPROXIMATELY EQUALING FOUR TIMES THE WEIGHT OF THE PHOSPHORUS CONTAINED IN THE NEXT BATCH OF PIG IRON TO BE REFINED FOR USE AS FIRST SLAG WITH SAID NEXT BATCH, AND THEN FINISHING THE REFINING PROCESS IN SAID REACTION CHAMBER.
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) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |