US3202502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the comminution of siliceous iron ores
Assignee: The Broken Hill Proprietary Company Pty Ltd
•
Filing: 1961-12-11
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Granted: 1965-08-24
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Expires: 1981-12-11
Abstract
No abstract record available.
Inventors
- 👤 Lean John Barry
- 👤 Worner Howard Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:17
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; B; B02; B02C; B02C17/00; B02C17/04; B03; B03B; B03B1/00; B03B1/02; C22B1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
PROCESS FOR THE HIGH TEMPERATURE AUTOGENOUS GRINDING OF ORES, WHICH COMPRISES TUMBLING AND AUTOGENOUSLY GRINDING LUMP IRON ORE IN A GRINDING DRUM FITTED WITH LIFTERS AND ROTATED AT SPEEDS WITHIN ABOUT 30% OF THE CRITICAL SPEED OF THE DRUM WHILE MAINTAINING A SUFFICIENT LAYER OF ORE ON THE INNER CIRCUMFERENCE OF HTE DRUM TO AFFORD PROTECTION OF THE DRUM SURFACE AGAINST WEAR AND CHEMICAL ACTION AND PROVIDE A HEAT INSULATING MEDIUM,
Claim 2
Dependent Claim
71 words
PROCESS FOR THE HIGH TEMPERATURE AUTOGENOUS GRINDING OF ORES, WHICH COMPRISES TUMBLING AND AUTOGENOUSLY GRINDING LUMP IRON ORE IN A GRINDING DRUM FITTED WITH LIFTERS AND ROTATED AT SPEEDS WITHIN ABOUT 30% OF THE CRITICAL SPEED OF THE DRUM WHILE MAINTAINING A SUFFICIENT LAYER OF ORE ON THE INNER CIRCUMFERENCE OF HTE DRUM TO AFFORD PROTECTION OF THE DRUM SURFACE AGAINST WEAR AND CHEMICAL ACTION AND PROVIDE A HEAT INSULATING MEDIUM,
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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) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |