Patent US3397844A successfully refreshed from Google Patents.
US3397844A
Expired / Lapsed
US
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Product sizing control in a grinding circuit closed by a separating means
Assignee: Erie Development Co
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Filing: 1962-09-19
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Granted: 1968-08-20
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Expires: 1982-09-19
Abstract
No abstract record available.
Inventors
- 👤 Henry P Whaley
- 👤 Mark L Hovland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:24
CPC Classifications
B; B02; B02C; B02C25/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN SUBDIVIDING AND CONCENTRATING AN ORE IN A GRINDING CIRCUIT INCLUDING A BALL MILL, WHICH GRINDING CIRCUIT IS CLOSE-CIRCUITED BY A CYCLONE SEPARATOR, THE IMPROVED METHOD OF ENSURING CONSTANT PRODUCT SIZING FROM THE CIRCUIT WHICH CONSISTS IN SUBSTANTIALLY CONSTANTLY MEASURING THE DENSITY OF THE FEED TO THE CYCLONE SEPARATOR AND CONTROLLING THE CIRCUIT AT A PREDETERMINED DENSITY VALUE BY VARYING THE NEW TONNAGE RATE TO THE GRINDING CIRCUIT IN SPECIFIED INCREMENTS AT SPECIFIED TIME INTERVALS THE VARIATION BEING INVERSELY PROPORTIONAL TO VARIATION IN THE DENSITY OF THE FEED TO THE CYCLONE SEPARATOR.
Claim 2
Dependent Claim
92 words
IN SUBDIVIDING AND CONCENTRATING AN ORE IN A GRINDING CIRCUIT INCLUDING A BALL MILL, WHICH GRINDING CIRCUIT IS CLOSE-CIRCUITED BY A CYCLONE SEPARATOR, THE IMPROVED METHOD OF ENSURING CONSTANT PRODUCT SIZING FROM THE CIRCUIT WHICH CONSISTS IN SUBSTANTIALLY CONSTANTLY MEASURING THE DENSITY OF THE FEED TO THE CYCLONE SEPARATOR AND CONTROLLING THE CIRCUIT AT A PREDETERMINED DENSITY VALUE BY VARYING THE NEW TONNAGE RATE TO THE GRINDING CIRCUIT IN SPECIFIED INCREMENTS AT SPECIFIED TIME INTERVALS THE VARIATION BEING INVERSELY PROPORTIONAL TO VARIATION IN THE DENSITY OF THE FEED TO THE CYCLONE SEPARATOR.
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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) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |