US3384310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating metalliferous ores
Assignee: Cleveland Cliffs Iron Co
•
Filing: 1966-02-16
•
Granted: 1968-05-21
•
Expires: 1986-02-16
Abstract
No abstract record available.
Inventors
- 👤 William R Van Slyke
- 👤 Louis J Erck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:21
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
THE METHOD OF TREATING ORES WHICH COMPRISES THE STEPS OF: (A) SCREENING A METALLIFEROUS ORE AND SEPARATING IT INTO A PORTION OF LARGE PIECES AND PORTION OF SMALLER PIECES, (B) CRUSHING THE PORTION OF SMALLER PIECES TO ABOUT -2", (C) SEPARATING THE COMBINED CRUSHED AND NATURALLY OCCURRING PORTIONS TO FORM AT LEAST A FRACTION OF -2" +1/2" AND ANOTHER FRACTION OF -1/2", (D) CONCENTRATING THE METAL VALUES OF THE -1/2" FRACTION IN A LOW GRAVITY HEAVY MEDIA SEPARATOR, (E) CONCENTRATING THE METAL VALUES OF THE -2" +1/2" FRACTION IN A HIGHER GRAVITY HEAVY MEDIA SEPARATOR, (F) CRUSHING THE METAL VALUES FROM SAID HIGHER GRAVITY HEAVY MEDIA SEPARATOR TO ABOUT -3/4" AND SCREENING THE CRUSHED MATERIAL AND RECYCLING IT THROUGH THE HIGHER AND LOWER GRAVITY MEDIA SEPARATORS.
Claim 2
Independent Claim
126 words
THE METHOD OF TREATING ORES WHICH COMPRISES THE STEPS OF: (A) SCREENING A METALLIFEROUS ORE AND SEPARATING IT INTO A PORTION OF LARGE PIECES AND PORTION OF SMALLER PIECES, (B) CRUSHING THE PORTION OF SMALLER PIECES TO ABOUT -2", (C) SEPARATING THE COMBINED CRUSHED AND NATURALLY OCCURRING PORTIONS TO FORM AT LEAST A FRACTION OF -2" +1/2" AND ANOTHER FRACTION OF -1/2", (D) CONCENTRATING THE METAL VALUES OF THE -1/2" FRACTION IN A LOW GRAVITY HEAVY MEDIA SEPARATOR, (E) CONCENTRATING THE METAL VALUES OF THE -2" +1/2" FRACTION IN A HIGHER GRAVITY HEAVY MEDIA SEPARATOR, (F) CRUSHING THE METAL VALUES FROM SAID HIGHER GRAVITY HEAVY MEDIA SEPARATOR TO ABOUT -3/4" AND SCREENING THE CRUSHED MATERIAL AND RECYCLING IT THROUGH THE HIGHER AND LOWER GRAVITY MEDIA SEPARATORS.
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) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |