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US2831210A
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US
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Doctoring device for balling-up drum
Assignee: Erie Mining Co
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Filing: 1951-02-16
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Granted: 1958-04-22
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Expires: 1971-02-16
Abstract
No abstract record available.
Inventors
- 👤 Vaney Fred D De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:00
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/12; C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/2406
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1540662A
Cited
US1775313A
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US1883112A
Cited
US1980130A
Cited
US2357941A
Cited
US2293439A
Cited
US2422989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |