Patent US2804170A successfully refreshed from Google Patents.
US2804170A
Expired / Lapsed
US
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Automatic continuous discharge air lock for cyclone separator
Assignee: BEAUMONT BIRCH CO
•
Filing: 1954-02-03
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Granted: 1957-08-27
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Expires: 1974-02-03
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Pynor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:21
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/14; B04C5/15; B04C11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1440033A
Cited
US1781352A
Cited
US1908181A
Cited
US1995651A
Cited
DE685339C
Cited
US2393766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |