Patent US2939638A successfully refreshed from Google Patents.
US2939638A
Expired / Lapsed
US
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Pulverizing and classifying apparatus
Assignee: Strong-Scott Manufacturing Co
•
Filing: 1956-10-17
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Granted: 1960-06-07
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Expires: 1976-10-17
Abstract
No abstract record available.
Inventors
- 👤 John T Haigh
- 👤 Raymond C Roloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:39
CPC Classifications
B; B02; B02C; B02C13/00; B02C13/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1260406A
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US1621571A
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US1765309A
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US1527818A
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US1770198A
Cited
US1855171A
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US2399051A
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US2573129A
Cited
US2672296A
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DE919980C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |