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US2500908A
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Gyratory impact ball mill and grinding method
Assignee: Nordberg Manufacturing Co
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Filing: 1947-12-26
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Granted: 1950-03-14
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Expires: 1967-12-26
Abstract
No abstract record available.
Inventors
- 👤 Loren G Symons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:00
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE260777C
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US13892A
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DE331540C
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US652106A
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US706102A
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GB361992A
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GB485969A
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US2144145A
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US2433872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |