Patent US3587487A successfully refreshed from Google Patents.
US3587487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal slurry feed system
Assignee: Combustion Engineering Inc
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Filing: 1970-02-20
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Granted: 1971-06-28
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Expires: 1990-02-20
Abstract
Abstract A SLURRY SUPPLY FOR SUPPLYING COAL TO A STEAM GENERATOR FROM A COAL SLURRY TANK. A SLURRY SUPPLY HEADER HAS A PLURALITY OF VALVED OFFTAKES SUPPLYING DEWATERING MACHINES WHICH IN TURN SUPPLY THE DEWATERED COAL TO THE STEAM GENERATOR. A SUPPLY LINE FROM THE TANK TO THE HEADER INCLUDES A CONSTANT SPEED CENTRIFUGAL PUMP. A RETURN LINE FROM THE SUPPLY HEADER TO THE TANK INCLUDES A VARIABLE THROTTLING VALVE WHICH IS OPERATED TO MAINTAIN A CONSTANT VELOCITY IN THE SUPPLY LINE AND ALSO A CONSTANT PRESSURE IN THE SUPPLY HEADER ACROSS THE LOAD RANGE OF A STEAM GENERATOR.
Inventors
- 👤 John A Makuch
- 👤 Richard D Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:01
CPC Classifications
F; F23; F23K; F23K3/00; F23K2203/00; F23K2203/006
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 |