US3207304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of concentrating fluorspar ores
Assignee: Dow Chemical Co
•
Filing: 1962-11-15
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Granted: 1965-09-21
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Expires: 1982-11-15
Abstract
No abstract record available.
Inventors
- 👤 Thom Clarence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:44
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/016; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
IN A PROCESS OF CONCENTRATING FLUORSPAR ORE BY FROTH FLOTATION INCLUDING THE STEPS OF COMMINUTING AND PULPING THE ORE WITH WATER, PRE-CONDITIONING THE PULPED ORE, ADDING A COLLECTOR REAGENT TO SAID ORE AND SUBJECTING THE PRE-CONDITIONED ORE TO A FLOTATION OPERATION TO RECOVER THE FLUORSPAR VALUES, THE IMPROVEMENT WHICH COMPRISES: PRE-CONDITIONING THE PULPED ORE FOR A PERIOD OF TIME WITH AN ACIDULATING DEPRESSING AGENT WHILE MAINTAINING THE TEMPERATURE ABOVE ABOUT 70*F. SAID ACIDULATING DEPRESSING AGENT BEING FURTHER CHARACTERIZED AS CONTAINING AN AMOUNT OF TANNIC ACID SUFFICIENT TO
Claim 2
Dependent Claim
87 words
IN A PROCESS OF CONCENTRATING FLUORSPAR ORE BY FROTH FLOTATION INCLUDING THE STEPS OF COMMINUTING AND PULPING THE ORE WITH WATER, PRE-CONDITIONING THE PULPED ORE, ADDING A COLLECTOR REAGENT TO SAID ORE AND SUBJECTING THE PRE-CONDITIONED ORE TO A FLOTATION OPERATION TO RECOVER THE FLUORSPAR VALUES, THE IMPROVEMENT WHICH COMPRISES: PRE-CONDITIONING THE PULPED ORE FOR A PERIOD OF TIME WITH AN ACIDULATING DEPRESSING AGENT WHILE MAINTAINING THE TEMPERATURE ABOVE ABOUT 70*F. SAID ACIDULATING DEPRESSING AGENT BEING FURTHER CHARACTERIZED AS CONTAINING AN AMOUNT OF TANNIC ACID SUFFICIENT TO
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |