US2869677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dunlab tube separators and coolant means therefor
Assignee: Bituminous Coal Research Inc
•
Filing: 1955-02-14
•
Granted: 1959-01-20
•
Expires: 1975-02-14
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 15:03
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/02; B04C5/04; B01; B01D; B01D45/00; B01D45/12; B04C5/20; F; F16; F16L; F16L55/00; F16L55/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US418836A
Cited
US769808A
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US1928702A
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US2638181A
Cited
US2582423A
Cited
GB658471A
Cited
US2650675A
Cited
US2681124A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |