Patent US3137648A successfully refreshed from Google Patents.
US3137648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pretreatment of minerals for electrostatic separation
Assignee: Individual
•
Filing: 1962-01-24
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Granted: 1964-06-16
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Expires: 1982-01-24
Abstract
No abstract record available.
Inventors
- 👤 Fraas Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:54
CPC Classifications
B; B03; B03C; B03C7/00; B03C7/003
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
A PROCESS FOR PRETREATING THE CONSTITUENTS OF A MINERAL COMPOSIITE ORE, COMPRISING COMMINUTING SAID ORE TO PARTICULATE FORM, ISOLATING ORE FROM ATMOSPHERIC CONDITIONS BY ENCLOSING IT IN A ZONE, PASSING A FLUID INTO SAID ZONE TO FILL THE SAME, AND TREATING THE SAID ORE BY PASSING AN ELECTRIC DISCHARGE THROUGH SAID FLUID, WHEREBY AT LEAST ONE OF THE COMPOSITE CONSTITUENTS OF SAID ORE SO TREATED CHANGES ITS CONDUCTIVITY AND CONTACT ELECTRIFICATION PROPERTIES.
References Cited (Backward Citations)
US1153182A
Cited
US2723029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |