Patent US3215523A successfully refreshed from Google Patents.
US3215523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of off-gas from a steel converter
Assignee: Chemical Construction Corp
•
Filing: 1963-05-27
•
Granted: 1965-11-02
•
Expires: 1983-05-27
Abstract
No abstract record available.
Inventors
- 👤 Harry L Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:44
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/38; C21C5/40; Y; Y02; Y02P; Y02P10/00; Y02P10/25; Y10; Y10S; Y10S261/00; Y10S261/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
METHOD OF PREVENTING AIR ENTRY INTO A STEEL CONVERTER CONTAINING MOLTEN FERROUS METAL AND PROVIDED WITH A HOOD WHICH COMPRISES PASSING A STEAM CURTAIN BETWEEN SAID CONVERTER AND SAID HOOK, WITHDRAWING A MIXED STREAM OF CONVERTER OFF-GAS AND STEAM FROM SAID HOOD, PARTIALLY COOLING SAID MIXED STREAM IN A WASTE HEAT BOILER WHEREBY STEAM IS GENERATED AT ELEVATED PRESSURE, EXPANDING THE P GENERATED STEAM THROUGH A NON-CONDENSING TURBINE FOR POWER GENERATION, RECYCLING THE EXPANDED STEAM AS SAID STEAM CURTAIN, AND FURTHER COOLING SAID MIXED STREAM TO CONDENSE STEAM AND RECOVER A SUBSTANTIALLY UNDILUTED CONVERTER OFF-GAS.
Claim 2
Dependent Claim
95 words
METHOD OF PREVENTING AIR ENTRY INTO A STEEL CONVERTER CONTAINING MOLTEN FERROUS METAL AND PROVIDED WITH A HOOD WHICH COMPRISES PASSING A STEAM CURTAIN BETWEEN SAID CONVERTER AND SAID HOOK, WITHDRAWING A MIXED STREAM OF CONVERTER OFF-GAS AND STEAM FROM SAID HOOD, PARTIALLY COOLING SAID MIXED STREAM IN A WASTE HEAT BOILER WHEREBY STEAM IS GENERATED AT ELEVATED PRESSURE, EXPANDING THE P GENERATED STEAM THROUGH A NON-CONDENSING TURBINE FOR POWER GENERATION, RECYCLING THE EXPANDED STEAM AS SAID STEAM CURTAIN, AND FURTHER COOLING SAID MIXED STREAM TO CONDENSE STEAM AND RECOVER A SUBSTANTIALLY UNDILUTED CONVERTER OFF-GAS.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |