Patent US3750469A successfully refreshed from Google Patents.
Patent US2712980A successfully refreshed from Google Patents.
US2712980A
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Process for using sulphate liquors for recovering values from coke oven gas
Assignee: Individual
•
Filing: 1952-09-06
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Granted: 1955-07-12
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Expires: 1972-09-06
Abstract
No abstract record available.
Inventors
- 👤 Richard D Hoak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:21
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/08; C10K1/10; C10K1/105; C10K1/106
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
IN A PROCESS WHEREIN AN AQUEOUS SOLUTION CONTAINING FERROUS SULFATE AND SULFURIC ACID IS CONTACTED WITH COKE OVEN GAS CONTAINING AMMONIA, HYDROGEN SULFIDE, HYDROGEN CYANIDE, THIOCYANIC ACID AND TAR BASES, TO PRODUCE LIQUOR CONTAINING AMMONIUM SULFATE, IRON SULFIDE, IRON FERROCYANIDE, AMMONIUM THIOCYANATE, AND TAR BASES, AND THE LIQUOR IS THEREAFTER CONTACTED WITH OXYGEN-CONTAINING GAS, THE IMPROVEMENT WHICH COMPRISES CONTACTING THE LIQUOR AT A TEMPERATURE OF 45* TO 50* C. AND AT A PH OF 6.5 TO 7.5 WITH OXYGEN-CONTAINING GAS WITH AN INTENSITY SUFFICIENT TO CONVERTED IRON SULFIDE INTO OXIDE AND FREE SULFUR.
Claim 2
Dependent Claim
93 words
IN A PROCESS WHEREIN AN AQUEOUS SOLUTION CONTAINING FERROUS SULFATE AND SULFURIC ACID IS CONTACTED WITH COKE OVEN GAS CONTAINING AMMONIA, HYDROGEN SULFIDE, HYDROGEN CYANIDE, THIOCYANIC ACID AND TAR BASES, TO PRODUCE LIQUOR CONTAINING AMMONIUM SULFATE, IRON SULFIDE, IRON FERROCYANIDE, AMMONIUM THIOCYANATE, AND TAR BASES, AND THE LIQUOR IS THEREAFTER CONTACTED WITH OXYGEN-CONTAINING GAS, THE IMPROVEMENT WHICH COMPRISES CONTACTING THE LIQUOR AT A TEMPERATURE OF 45* TO 50* C. AND AT A PH OF 6.5 TO 7.5 WITH OXYGEN-CONTAINING GAS WITH AN INTENSITY SUFFICIENT TO CONVERTED IRON SULFIDE INTO OXIDE AND FREE SULFUR.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-11 | 1959-01-10 | 1959-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-11 | 1963-01-10 | 1963-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-11 | 1967-01-10 | 1967-07-12 | $7700.00 | Window Closed / Lapsed |