US2812828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse flow vortical whirl separators with chambered pneumatic blowdown means for continuous removal of separated particles
Assignee: Bituminous Coal Research Inc
•
Filing: 1955-02-07
•
Granted: 1957-11-12
•
Expires: 1975-02-07
Abstract
No abstract record available.
Inventors
- 👤 John I Yellott
- 👤 Peter R Broadley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:18
CPC Classifications
B; B04; B04C; B04C7/00; B04C5/00; B04C5/02; B04C5/06; B04C5/12; B04C5/13; B04C5/14; B04C5/181; B04C5/185
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
FR956552A
Cited
US1844369A
Cited
CH176352A
Cited
US2069483A
Cited
US2222930A
Cited
GB555908A
Cited
GB700791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |