Patent US3837488A successfully refreshed from Google Patents.
US3837488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of mica from clay by froth flotation of clay
Assignee: BASF Catalysts LLC
•
Filing: 1972-08-01
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Granted: 1974-09-24
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Expires: 1992-08-01
Abstract
Abstract Mica, present as an impurity in kaolin clay, is removed from the clay particles by stage-wise froth flotation of the clay in a dispersed alkaline pulp, using as a collector for the clay a complex phosphate ester of a nonionic surfactant of the ethylene oxide-adduct type.
Inventors
- 👤 D Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:10
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/06; B03D1/001; B03D1/004; B03D1/014; B03D2201/00; B03D2201/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
The process of claim 1 wherein said tailings is reconditioned with additional phosphate ester collector and subjected to froth flotation at least one more time, and combining the froth products to produce a purified clay product.
Claim 2
Dependent Claim
26 words
The process of claim 2 in which said phosphate ester is a mixture of monoester and diester, principally diester, wherein the monoester has the following formula:
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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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |