Patent US2563674A successfully refreshed from Google Patents.
Patent US4648943A successfully refreshed from Google Patents.
Patent US3105757A successfully refreshed from Google Patents.
US3105757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the preparation of ferrous oxide
Assignee: Renault SA
•
Filing: 1961-03-10
•
Granted: 1963-10-01
•
Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
- 👤 Peras Lucien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:08
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
THE METHOD FOR PREPARING FEO FROM ORES OF HIGHER OXIDES OF IRON WHICH COMPRISES REACTING A METHANE-RICH GAS IN A COMBUSTION ZONE WITH PRIMARY AIR IN PROPORTONS FOR INCOMPLETE COMBUSTON THEREBY PRODUCING A FIRST REDUCING GAS STREAM COMPRISING CO, MIXING SAID FIRST STREAM WITH A SECOND GAS STREAM ALSO COMPRISING CO, SAID SECOND STREAM BEING AT A TEMPERATURE SUCH THAT THE TEMPERATURE OF THE COMBUSTION ZONE IS APPROXIMATELY 1000* C., PASSING THE RESULTING MIXTURE OF HOT GASES COMPRISING CO COUNTER-CURRENT TO AND IN CONTACT WITH AN ADVANCING STREAM OF SAID ORE OF HIGHER OXIDES OD IEON IN REDUCING ZONE THEREBY REDUCING SAID HIGHER OXIDES OF IRON IN A REDUCING WITHDRAWING GASEOUS EFFIEUENT FROM SAID REDUCING ZONE, DIVIDING SAID EFFLUENT INTO TWO APPROXIMATELY EQUAL PORTIONS, BURINING ONE OF SAID PORTIONS COMPLETELY WITH SECONDARY AIR IN RECUPRATIVE HEAT EXCHANGE WITH THE OTHER SAID PORTION, RECYCLING THE THUS-HEATED SECOND PORTON TO DAID COMBUSTON ZONE AS SAID SECOND GAS STREAM AND DISCHARGING THE TREATED ORE COMPRISING FEO FROM SAID REDUCING ZONE.
Claim 2
Independent Claim
167 words
THE METHOD FOR PREPARING FEO FROM ORES OF HIGHER OXIDES OF IRON WHICH COMPRISES REACTING A METHANE-RICH GAS IN A COMBUSTION ZONE WITH PRIMARY AIR IN PROPORTONS FOR INCOMPLETE COMBUSTON THEREBY PRODUCING A FIRST REDUCING GAS STREAM COMPRISING CO, MIXING SAID FIRST STREAM WITH A SECOND GAS STREAM ALSO COMPRISING CO, SAID SECOND STREAM BEING AT A TEMPERATURE SUCH THAT THE TEMPERATURE OF THE COMBUSTION ZONE IS APPROXIMATELY 1000* C., PASSING THE RESULTING MIXTURE OF HOT GASES COMPRISING CO COUNTER-CURRENT TO AND IN CONTACT WITH AN ADVANCING STREAM OF SAID ORE OF HIGHER OXIDES OD IEON IN REDUCING ZONE THEREBY REDUCING SAID HIGHER OXIDES OF IRON IN A REDUCING WITHDRAWING GASEOUS EFFIEUENT FROM SAID REDUCING ZONE, DIVIDING SAID EFFLUENT INTO TWO APPROXIMATELY EQUAL PORTIONS, BURINING ONE OF SAID PORTIONS COMPLETELY WITH SECONDARY AIR IN RECUPRATIVE HEAT EXCHANGE WITH THE OTHER SAID PORTION, RECYCLING THE THUS-HEATED SECOND PORTON TO DAID COMBUSTON ZONE AS SAID SECOND GAS STREAM AND DISCHARGING THE TREATED ORE COMPRISING FEO FROM SAID REDUCING ZONE.
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) | 1966-09-30 | 1967-04-01 | 1967-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-30 | 1971-04-01 | 1971-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-30 | 1975-04-01 | 1975-10-01 | $7700.00 | Window Closed / Lapsed |