Patent US2823871A successfully refreshed from Google Patents.
US2823871A
Expired / Lapsed
US
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Multiple stage mill, with steeply conical shape pregrinding zone and flat disk terminal fine grinding zone
Assignee: Individual
•
Filing: 1953-08-07
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Granted: 1958-02-18
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Expires: 1973-08-07
Abstract
No abstract record available.
Inventors
- 👤 Larsson Johan Olov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:38
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/20; D21D1/30; B; B02; B02C; B02C7/00; B02C7/02; B02C7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US12461A
Cited
US133455A
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US1645847A
Cited
US636121A
Cited
US736657A
Cited
AT37610B
Cited
US1869833A
Cited
US2063996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |