Patent US2861423A successfully refreshed from Google Patents.
US2861423A
Expired / Lapsed
US
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Combined combustion chamber for burning pulverized fuel and flyash separator
Assignee: Individual
•
Filing: 1956-06-13
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Granted: 1958-11-25
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Expires: 1976-06-13
Abstract
No abstract record available.
Inventors
- 👤 Jerie Jan
- 👤 Fencl Zdenek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:20
CPC Classifications
F; F23; F23R; F23R5/00; F23C; F23C3/00; F23C3/006; F23C3/008; F23J; F23J15/00; F23J15/02; F23J15/022; F23J15/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2616256A
Cited
US2583921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |