US3008656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding
Assignee: FRED H JOWSEY
•
Filing: 1958-10-07
•
Granted: 1961-11-14
•
Expires: 1978-10-07
Abstract
No abstract record available.
Inventors
- 👤 Weston David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:11
CPC Classifications
B; B02; B02C; B02C17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A METHOD OF FINE GRINDING PARTICULATE FEED MATERIAL OF TACONITE OF PARTICLE SIZE PREDOMINANTLY BETWEEN THE RANGE OF 10 MESH AND 200 MESH IN A BALL MILL WHICH COMPRISES MAINTAINING A BALL CHARGE OF MAXIMUM DIAMETER NOT EXCEEDING ABOUT ONE INCH AND OF SPECIFIC GRAVITY RANGING FROM ABOUT SEVEN TO ABOUT 9 INTEGERS HIGHER THAN THE SPECIFIC GRAVITY OF THE MATERIAL TO BE GROUND, SAID BALL CHARGE CONSTITUTING ABOUT 35% TO ABOUT 50% OF THE MILL VOLUME INCLUDING VOIDS, FORMING A MILL CHARGE OF SAID MATERIAL AND SAID BALLS, AND SUBJECTING THE CHARGE TO THE ACTION OF SAID BALL MILL AT A SPEED OF ROTATION WITHIN THE RANGE OF ABOUT 50% TO 90% OF THE CRITICAL SPEED OF THE MILL.
Claim 2
Independent Claim
120 words
A METHOD OF FINE GRINDING PARTICULATE FEED MATERIAL OF TACONITE OF PARTICLE SIZE PREDOMINANTLY BETWEEN THE RANGE OF 10 MESH AND 200 MESH IN A BALL MILL WHICH COMPRISES MAINTAINING A BALL CHARGE OF MAXIMUM DIAMETER NOT EXCEEDING ABOUT ONE INCH AND OF SPECIFIC GRAVITY RANGING FROM ABOUT SEVEN TO ABOUT 9 INTEGERS HIGHER THAN THE SPECIFIC GRAVITY OF THE MATERIAL TO BE GROUND, SAID BALL CHARGE CONSTITUTING ABOUT 35% TO ABOUT 50% OF THE MILL VOLUME INCLUDING VOIDS, FORMING A MILL CHARGE OF SAID MATERIAL AND SAID BALLS, AND SUBJECTING THE CHARGE TO THE ACTION OF SAID BALL MILL AT A SPEED OF ROTATION WITHIN THE RANGE OF ABOUT 50% TO 90% OF THE CRITICAL SPEED OF THE MILL.
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) | 1964-11-13 | 1965-05-15 | 1965-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-13 | 1969-05-15 | 1969-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-13 | 1973-05-15 | 1973-11-14 | $7700.00 | Window Closed / Lapsed |