US3180723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical process
Assignee: ChampionX LLC
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Filing: 1963-05-27
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Granted: 1965-04-27
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Expires: 1983-05-27
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Mccauley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:16
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/242
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
IN A METALLURGICAL METHOD OF SINTERING IRON ORE PELLETS WHICH COMPRISES THE STEPS OF ADDING TOGETHER FINELY DIVIDED IRON ORE, COKE, A CALCIUM CARBONATE-CONTAINING MATERIAL, AND A CONCENTRATED AQUEOUS IRON ORE SLURRY WHEREBY A WETTED PARTICULATE MASS IS FORMED, PELLETIZING SAID MASS TO FORM INTEGRAL UNITS AND FIRING SAID FORMED PELLET UNITS TO A HARDENED STATE; THE IMPROVEMENT WHICH COMPRISES COMBINING WITH SAID CONCENTRATED AQUEOUS IRON ORE SLURRY A MINOR AMOUNT OF AN ACRYLAMIDE POLYMER, SAID COMBINATION HAVING BEEN ACCOMPLISHED BY FIRST SUBJECTING A LESS CONCENTRATED AQUEOUS IRON ORE SLURRY FEED TO CENTRIFUGATION IN PRESENCE OF A CENTRIFUGE AID COMPRISING SAID ACRYLAMIDE POLYMER, THEREAFTER SEPARATING THE MORE CONCENTRATED AQUEOUS IRON ORE SLURRY FROM THE FREED AQUEOUS FILTRATE LIQUID AND REMOVING FROM THE SYSTEM SAID AQUEOUS LIQUID FILTRATE IN A FORM SUBSTANTIALLY FREE FROM IRON ORE SOLIDS.
Claim 2
Dependent Claim
136 words
IN A METALLURGICAL METHOD OF SINTERING IRON ORE PELLETS WHICH COMPRISES THE STEPS OF ADDING TOGETHER FINELY DIVIDED IRON ORE, COKE, A CALCIUM CARBONATE-CONTAINING MATERIAL, AND A CONCENTRATED AQUEOUS IRON ORE SLURRY WHEREBY A WETTED PARTICULATE MASS IS FORMED, PELLETIZING SAID MASS TO FORM INTEGRAL UNITS AND FIRING SAID FORMED PELLET UNITS TO A HARDENED STATE; THE IMPROVEMENT WHICH COMPRISES COMBINING WITH SAID CONCENTRATED AQUEOUS IRON ORE SLURRY A MINOR AMOUNT OF AN ACRYLAMIDE POLYMER, SAID COMBINATION HAVING BEEN ACCOMPLISHED BY FIRST SUBJECTING A LESS CONCENTRATED AQUEOUS IRON ORE SLURRY FEED TO CENTRIFUGATION IN PRESENCE OF A CENTRIFUGE AID COMPRISING SAID ACRYLAMIDE POLYMER, THEREAFTER SEPARATING THE MORE CONCENTRATED AQUEOUS IRON ORE SLURRY FROM THE FREED AQUEOUS FILTRATE LIQUID AND REMOVING FROM THE SYSTEM SAID AQUEOUS LIQUID FILTRATE IN A FORM SUBSTANTIALLY FREE FROM IRON ORE SOLIDS.
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) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |