Patent US3145693A successfully refreshed from Google Patents.
Patent US3587489A successfully refreshed from Google Patents.
US3587489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnaces for solid fuel
Assignee: Ekman C O A
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Filing: 1969-04-30
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Granted: 1971-06-28
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Expires: 1989-04-30
Abstract
Abstract A FURNACE FOR BURNING SOLID FUELS SUCH AS BITUMINOUS COALS COMPRISES A GRATE, A FUEL INLET SHAFT WHCH COMMUNICATES ONLY AT ITS LOWER END WITH A COMBUSTION CHAMBER ABOVE THE GRATE BY MEANS OF A RESTRICTED OPENING BENEATH A SOLID TRANSVERSE WALL, THE LOWER END PORTION OF THE FUEL INLET SHAFT FORMING A DEGASSING CHAMBER. A GAS DUCT IS PROVIDED FOR CONVEYING GAS FROM THE DEGASSING CHAMBER FOR DISTRIBUTION BENEATH A REARWARD SECTION OF THE GRATE. IN ACCORDANCE WITH THE INVENTION, THE BOTTOM END OF THE DEGASSING CHAMBER PORTION OF THE INLET SHAFT IS CLOSED.
Inventors
- 👤 Viking Valentin Demar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:33
CPC Classifications
F; F23; F23B; F23B1/00; F23B1/02; F23B2700/00; F23B2700/011
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |