US3179345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling a grinding mill
Assignee: United States Steel Corp
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Filing: 1963-07-29
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Granted: 1965-04-20
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Expires: 1983-07-29
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Kivert
- 👤 Stewart W Tresouthick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:49
CPC Classifications
B; B02; B02C; B02C25/00; B02C23/00; B02C23/08; B02C23/10; B02C23/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
IN A CLOSED-CIRCUIT GRINDING PROCESS IN WHICH NEW MATERIAL FEEDS CONTINUOUSLY TO A GRINDING MILL, MATERIAL DISCHARGES CONTINUOUS FROM THE MILL TO AN ELEVATOR BOOT, AN ELEVATOR CONTINUOUSLY CARRIES MATERIAL FROM THE BOOT, TO A CLASSIFIER, A FINISHED PRODUCT IS RECOVERED FROM THE CLASSIFIER, AND AN OVERSIZED PRODUCT CONTINUOUSLY RETURNS FROM THE CLASSIFIER TO THE MILL FOR FURTHER GRINDING, A CONTROL METHOD COMPRISING SENSING THE LEVER OF MATERIAL IN SAID BOOT, AND ADJUSTING THE RATE AT WHICH NEW MATERIAL FEEDS TO SAID MILL IN ACCORDANCE WITH THE LEVEL SENSED IN SAID BOOT TO MAINTAIN THIS LEVEL SUBSTANTIALLY CONSTANT, WHEREBY
Claim 2
Dependent Claim
99 words
IN A CLOSED-CIRCUIT GRINDING PROCESS IN WHICH NEW MATERIAL FEEDS CONTINUOUSLY TO A GRINDING MILL, MATERIAL DISCHARGES CONTINUOUS FROM THE MILL TO AN ELEVATOR BOOT, AN ELEVATOR CONTINUOUSLY CARRIES MATERIAL FROM THE BOOT, TO A CLASSIFIER, A FINISHED PRODUCT IS RECOVERED FROM THE CLASSIFIER, AND AN OVERSIZED PRODUCT CONTINUOUSLY RETURNS FROM THE CLASSIFIER TO THE MILL FOR FURTHER GRINDING, A CONTROL METHOD COMPRISING SENSING THE LEVER OF MATERIAL IN SAID BOOT, AND ADJUSTING THE RATE AT WHICH NEW MATERIAL FEEDS TO SAID MILL IN ACCORDANCE WITH THE LEVEL SENSED IN SAID BOOT TO MAINTAIN THIS LEVEL SUBSTANTIALLY CONSTANT, WHEREBY
References Cited (Backward Citations)
US1778393A
Cited
US3114510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |