Patent US3307790A successfully refreshed from Google Patents.
US3307790A
Expired / Lapsed
US
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Flotation method and apparatus
Assignee: Mineral Industries Corp of America
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Filing: 1963-03-20
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Granted: 1967-03-07
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Expires: 1983-03-20
Abstract
No abstract record available.
Inventors
- 👤 Morris I Cohn
- 👤 Roy D Perdue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:13
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/08; B03D1/082; B03D1/14; B03D1/1406; B03D1/1443; B03D1/1456; B03D1/1462; B03D1/1475; B03D1/16; B03D1/06; Y; Y10; Y10S; Y10S209/00; Y10S209/901
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
59 words
A METHOD OF MINERAL BENEFICATION COMPRISING FORMING A LIQUID SLURRY OF MINERAL PARTICLES, FORCING SAID SLURRY IN THE FORM OF A THIN FILM EDGEWISE THROUGH A THIN, HARDSURFACED GAP UNDER A HIGH PRESSURE AND AT A HIGH VELOCITY BY VIRTUE OF REDUCTION OF SAID HIGH PRESSURE TO A SUBSTANTIALLY LOWER PRESSURE, AND SUBJECTING THE RESULTING SLURRY TO FROTH FLOTATION.
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |