Patent US2831574A successfully refreshed from Google Patents.
US2831574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beneficiation of low grade magnesite ores
Assignee: Basic Inc
•
Filing: 1953-12-10
•
Granted: 1958-04-22
•
Expires: 1973-12-10
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Weinig
- 👤 James F Mcintosh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:49
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/01; B03D1/008; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
137 words
THE PROCESS OF TREATING BRUCITE-MAGNESIUM ORES FOR THE RECOVERY OF MAGNESIUM VALUES AS A CONCENTRATE OF THE TREATMENT, WHICH COMPRISES FORMING AN AQUEOUS PULP OF SUCH AN ORE HAVING A MAJOR PORTION OF ITS SOLID CONTENT IN A SIZE RANGE OF ABOUT -300 MESH, MAINTAINING THE CIRCULATING PULP OF THE TREATMENT AT A PH OF ABOUT 8.5, AND SUBJECTING SAID PULP TO A TWO-STAGE FLOTATION SEPARATION WITH CRESYLIC ACID AND A HIGHER MOLECULAR WEIGHT, ALIPHATIC AMINE INTRODUCED AS COLLECTOR REAGENT IN ONE STAGE OF SAID CONCENTRATION SO AS TO COLLECT SILICEOUS CONTENT OF THE ORE AS A FROTH CONCENTRATE OF SUCH A SEPARATION, AND INTRODUCING A COLLECTOR FOR THE MAGNESIUM MATERIALS AS A COLLECTOR IN ANOTHER STAGE OF SAID CONCENTRATION SO AS TO CONCENTRATE THE MAGNESIUM VALUES OF THE ORE AS A CONCENTRATE OF SAID OTHER STAGE.
References Cited (Backward Citations)
US2330479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |