US2911065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ash separator for powdered coal burning pressurized combustion system
Assignee: Bituminous Coal Research Inc
•
Filing: 1953-01-07
•
Granted: 1959-11-03
•
Expires: 1973-01-07
Abstract
No abstract record available.
Inventors
- 👤 John I Yellott
- 👤 Peter R Broadley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:16
CPC Classifications
F; F23; F23J; F23J15/00; F23J15/02; F23J15/022; F23J15/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR391315A
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GB469339A
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US139002A
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US1389909A
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GB580936A
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US2616252A
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US2506273A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-02 | 1963-05-04 | 1963-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-02 | 1967-05-04 | 1967-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-02 | 1971-05-04 | 1971-11-03 | $7700.00 | Window Closed / Lapsed |