US3276858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for carrying out gas-solids reactions
Assignee: Pullman Inc
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Filing: 1964-12-07
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Granted: 1966-10-04
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Expires: 1984-12-07
Abstract
No abstract record available.
Inventors
- 👤 Robert W Pfeiffer
- 👤 Jr Luther W Garrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:03
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/26; C; C21; C21B; C21B13/00; C21B13/0033; C22; C22B; C22B1/00; C22B1/02; C22B1/10; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A METHOD FOR REDUCING LOW-GRADE IRON-CONTAINING ORES WHICH CONTAIN MATERIAL DECOMPOSABLE AND/OR VOLATILE AT THE REDUCTION TEMPERATURE EMPLOYED TO REDUCE THE ORE WHICH COMPRISES: CONTACTING FEED MATERIAL COMPRISING SUCH ORE IN PARTICULATE FORM WITH A REHEATED GASEOUS EFFLUENT OF THE REDUCTION ZONE OBTAINED AS HEREINAFTER DEFINED TO HEAT SUCH PARTICULATE MATERIAL, PASSING A FIRST PORTION OF SUCH HEATED PARTICULATE MATERIAL TO A DENSE PHASE BED OF FLUIDIZIED PARTUCULATE MATERIAL MAINTAINED IN A PRETREATMENT ZONE ZONE, COMBUSTING A SUITABLE FUEL IN SAID PRETREATMENT ZONE MAINTAINED AT A TEMPERATURE BETWEEN ABOUT 1400 AND ABOUT 1800*F., MAINTAINING SAID FIRST PORTION OF PARTICULATE FEED MATERIAL IN A PRETREATMENT ZONE FOR A TIME SUFFICIENT TO HEAT THE PARTICULATE MATERIAL TO A TEMPERATURE WITHIN THE RANGE OF TEMPERATURES SET OUT ABOVE, ADMIXING SAID FIRST PORTION WITHDRAWN FROM THE PRETREATMENT ZONE WITH A SECOND PORTION OF SAID HEATED PARTICULATE MATERIAL TO OBTAIN A MIXTURE OF PARTICLES AT A TEMPERATURE WITHIN
Claim 2
Independent Claim
153 words
A METHOD FOR REDUCING LOW-GRADE IRON-CONTAINING ORES WHICH CONTAIN MATERIAL DECOMPOSABLE AND/OR VOLATILE AT THE REDUCTION TEMPERATURE EMPLOYED TO REDUCE THE ORE WHICH COMPRISES: CONTACTING FEED MATERIAL COMPRISING SUCH ORE IN PARTICULATE FORM WITH A REHEATED GASEOUS EFFLUENT OF THE REDUCTION ZONE OBTAINED AS HEREINAFTER DEFINED TO HEAT SUCH PARTICULATE MATERIAL, PASSING A FIRST PORTION OF SUCH HEATED PARTICULATE MATERIAL TO A DENSE PHASE BED OF FLUIDIZIED PARTUCULATE MATERIAL MAINTAINED IN A PRETREATMENT ZONE ZONE, COMBUSTING A SUITABLE FUEL IN SAID PRETREATMENT ZONE MAINTAINED AT A TEMPERATURE BETWEEN ABOUT 1400 AND ABOUT 1800*F., MAINTAINING SAID FIRST PORTION OF PARTICULATE FEED MATERIAL IN A PRETREATMENT ZONE FOR A TIME SUFFICIENT TO HEAT THE PARTICULATE MATERIAL TO A TEMPERATURE WITHIN THE RANGE OF TEMPERATURES SET OUT ABOVE, ADMIXING SAID FIRST PORTION WITHDRAWN FROM THE PRETREATMENT ZONE WITH A SECOND PORTION OF SAID HEATED PARTICULATE MATERIAL TO OBTAIN A MIXTURE OF PARTICLES AT A TEMPERATURE WITHIN
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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |