US3404846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Autogenous grinding mill
Assignee: Nordberg Manufacturing Co
•
Filing: 1964-02-24
•
Granted: 1968-10-08
•
Expires: 1984-02-24
Abstract
No abstract record available.
Inventors
- 👤 Arthur R Macpherson
- 👤 Guy L Saunders
- 👤 Robert C Meaders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:04
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A COMBINED CRUSHING AND GRINDING MILL IN WHICH THE ROCK ITSELF IS USED FOR GRINDING, COMPRISING A GENERALLY HORIZONTAL ROTATABLE DRUM HAVING A CYLINDRICAL WALL AND TWO GENERALLY SMOOTH VERTICAL END WALLS, THE RATIO OF THE INTERIOR DIAMETER OF THE DRUM AND THE INTERIOR LENGTH BEING OF THE ORDER OF 3 TO 1, MEANS FOR FEEDING COARSE FEED MATERIAL INTO SAID MILL, MEANS FOR WITHDRAWING THE PRODUCT FROM SAID MILL, AND A PLURALITY OF HIGHLY UPSTANDING TRANSVERSE IMPACT AND LIFTING ELEMENTS EXTENDING GENERALLY RADIALLY INWARDLY FROM THE WALL, SAID ELEMENTS BEING IN A SPACE HEIGHT RELATIONSHIP OF NOT LESS THAN 3 TO 1 AND NOT MORE THAN 4.5 TO 1, AND MEANS FOR ROTATING THE MILL IN THE SPEED RANGE OF GENERALLY FORM 72 PERCENT TO 80 PERCENT OF CRITICAL SPEED.
Claim 2
Dependent Claim
131 words
A COMBINED CRUSHING AND GRINDING MILL IN WHICH THE ROCK ITSELF IS USED FOR GRINDING, COMPRISING A GENERALLY HORIZONTAL ROTATABLE DRUM HAVING A CYLINDRICAL WALL AND TWO GENERALLY SMOOTH VERTICAL END WALLS, THE RATIO OF THE INTERIOR DIAMETER OF THE DRUM AND THE INTERIOR LENGTH BEING OF THE ORDER OF 3 TO 1, MEANS FOR FEEDING COARSE FEED MATERIAL INTO SAID MILL, MEANS FOR WITHDRAWING THE PRODUCT FROM SAID MILL, AND A PLURALITY OF HIGHLY UPSTANDING TRANSVERSE IMPACT AND LIFTING ELEMENTS EXTENDING GENERALLY RADIALLY INWARDLY FROM THE WALL, SAID ELEMENTS BEING IN A SPACE HEIGHT RELATIONSHIP OF NOT LESS THAN 3 TO 1 AND NOT MORE THAN 4.5 TO 1, AND MEANS FOR ROTATING THE MILL IN THE SPEED RANGE OF GENERALLY FORM 72 PERCENT TO 80 PERCENT OF CRITICAL SPEED.
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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) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |