Patent US2979393A successfully refreshed from Google Patents.
US2979393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of desulfurizing pig iron
Assignee: Individual
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Filing: 1958-10-02
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Granted: 1961-04-11
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Expires: 1978-10-02
Abstract
No abstract record available.
Inventors
- 👤 Jr Russell Pearce Heuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:02
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
THE PROCESS OF DESULFURIZING MOLTEN PIG IRON WHICH COMPRISES HOLDING THE MOLTEN PIG IRON UNDER REDUCING CONDITIONS IN A CLOSED VESSEL WHICH EXCLUDES AIR AND IS PROVIDED WITH A VENT ABOVE THE SURFACE OF THE MOLTEN PIG IRON AND BLOWING FROM A LANCE WHOSE MOUTH IS ABOVE THE SURFACE OF THE MOLTEN PIG IRON ONTO THAT SURFACE A DOWNWARDLY DIRECTED STREAM OF INERT GAS AT A PRESSURE IN THE GAS BEFORE IT LEAVES THE LANCE OF AT LEAST ONE ATMOSPHERE ABOVE THE PRESSURE IN THE VESSEL AND TREATING SAID MOLTEN IRON WITH A DESULFURIZING AGENT UNTIL AT LEAST 20 CUBIC FEET OF INERT GAS AT STANDARD CONDITIONS OF TEMPERATURE AND PRESSURE PER TONE OF PIG IRON HAS BEEN DISCHARGED BY THE LANCE DOWNWARD INTO THE MOLTEN PIG IRON AND THENCE PASSES UPWARD THROUGH THE MOLTEN IRON, OVER SAID IRON AND OUTWARD THROUGH SAID VENT.
Claim 2
Dependent Claim
144 words
THE PROCESS OF DESULFURIZING MOLTEN PIG IRON WHICH COMPRISES HOLDING THE MOLTEN PIG IRON UNDER REDUCING CONDITIONS IN A CLOSED VESSEL WHICH EXCLUDES AIR AND IS PROVIDED WITH A VENT ABOVE THE SURFACE OF THE MOLTEN PIG IRON AND BLOWING FROM A LANCE WHOSE MOUTH IS ABOVE THE SURFACE OF THE MOLTEN PIG IRON ONTO THAT SURFACE A DOWNWARDLY DIRECTED STREAM OF INERT GAS AT A PRESSURE IN THE GAS BEFORE IT LEAVES THE LANCE OF AT LEAST ONE ATMOSPHERE ABOVE THE PRESSURE IN THE VESSEL AND TREATING SAID MOLTEN IRON WITH A DESULFURIZING AGENT UNTIL AT LEAST 20 CUBIC FEET OF INERT GAS AT STANDARD CONDITIONS OF TEMPERATURE AND PRESSURE PER TONE OF PIG IRON HAS BEEN DISCHARGED BY THE LANCE DOWNWARD INTO THE MOLTEN PIG IRON AND THENCE PASSES UPWARD THROUGH THE MOLTEN IRON, OVER SAID IRON AND OUTWARD THROUGH SAID VENT.
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) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |