US3262771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of steel and zinc from waste materials
Assignee: McDowell-Wellman Engineering Co
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Filing: 1963-06-20
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Granted: 1966-07-26
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Expires: 1983-06-20
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Ban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:40
CPC Classifications
C; C22; C22B; C22B19/00; C22B19/04; C22B4/00; C22B4/04; C22B7/00; C22B7/001; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
A PROCESS FOR THE RECOVERY OF IRON AND ZINC VALUES FROM WASTE MATERIAL CONTANING FERRIC OXIDE AND ZINC RECOVERED IN STEEL-MAKING OPERATIONS COMPRISING THE STEPS OF MIXING SAID WASTE MATERIAL WITH COAL AND LIMESTONE, ADJUSTING THE WATER CONTENT OF THE RESULTING MIXTURE WITHIN THE RANGE OF 12% TO 16% BY WEIGHT, FORMING SAID WET MIXTURES INTO GREEN PELLETS, CARBONIZING SAID GREEN PELLETS SO AS TO BOND THE PELLET WHILE SIMULTANEOUSLY CALCINING THE LIMESTONE AND PARTIALLY REDUCING SAID FERRIC OXIDE, FEEDING SAID BONDED PELLETS TO AN ELECTRIC ARC FURNACE AND SUBJECTING THEM TO IRON-MAKING CONDITIONS THEREIN, REMOVING ZINC AS AN OVERHEAD VAPOR FROM SAID FURNACE,
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) | 1969-07-25 | 1970-01-24 | 1970-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-25 | 1974-01-24 | 1974-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-25 | 1978-01-24 | 1978-07-26 | $7700.00 | Window Closed / Lapsed |