Patent US4924863A successfully refreshed from Google Patents.
US3302873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal solids deliquefying and treating process and apparatus
Assignee: Pennwalt Corp
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Filing: 1964-02-21
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Granted: 1967-02-07
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Expires: 1984-02-21
Abstract
No abstract record available.
Inventors
- 👤 Kowata Yasuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:20
CPC Classifications
B; B04; B04B; B04B15/00; B04B15/12; B04B1/00; B04B1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
A CENTRIFUGE FOR SEPARATING LIQUIDS AND SOLIDS COMPRISING A BOWL HAVING AN IMPERFORATE PERIPHERAL WALL, A HELICAL CONVEYOR ELEMENT MOUNTED WITHIN AND COAXIAL OF SAID BOWL, MEANS FOR ROTATING THE BOWL AND CONVEYOR ELEMENT AT DIFFERENT SPEEDS, MEANS FOR FEEDING SLURRY TO THE BOWL, THE BOWL BEING FORMED WITH A SOLIDS DISCHARGE PORT, A LIQUID DISCHARGE PORT AND AN INWARDLY INCLINED WALL PORTION APPROACHING SAID SOLIDS DISCHARGE PORT FROM THE DIRECTION OF THE LIQUID DISCHARGE PORT, THE HELICAL CONVEYOR ELEMENT HAVING FLIGHT PORTIONS WITH DISTAL EDGES ADJACENT THE PERIPHERAL WALL OF THE BOWL, THE CONVEYOR ELEMENT HAVING PASSAGE MEANS THROUGH SAID PORTIONS AND OPENINGS FOR SAID PASSAGE MEANS ADJACENT THE DISTAL EDGES IN THE AREA OF THE INWARDLY INCLINED WALL PORTION AND AT A RADIUS GREATER THAN THE RADIUS OF SAID LIQUID DISCHARGE PORT, MEANS FOR FEEDING A TREATING LIQUID TO THE PASSAGE MEANS, WHEREBY TREATING LIQUID CAN BE EFFECTIVELY DELIVERED TO THE DEEP PORTION OF THE SOLIDS LAYER ENGAGED BY THE FLIGHT PORTIONS WHILE THE SOLIDS ARE STILL SUBMERGED AND AS THE SOLIDS APPROACH THE SOLIDS DISCHARGE PORT.
Claim 2
Dependent Claim
179 words
A CENTRIFUGE FOR SEPARATING LIQUIDS AND SOLIDS COMPRISING A BOWL HAVING AN IMPERFORATE PERIPHERAL WALL, A HELICAL CONVEYOR ELEMENT MOUNTED WITHIN AND COAXIAL OF SAID BOWL, MEANS FOR ROTATING THE BOWL AND CONVEYOR ELEMENT AT DIFFERENT SPEEDS, MEANS FOR FEEDING SLURRY TO THE BOWL, THE BOWL BEING FORMED WITH A SOLIDS DISCHARGE PORT, A LIQUID DISCHARGE PORT AND AN INWARDLY INCLINED WALL PORTION APPROACHING SAID SOLIDS DISCHARGE PORT FROM THE DIRECTION OF THE LIQUID DISCHARGE PORT, THE HELICAL CONVEYOR ELEMENT HAVING FLIGHT PORTIONS WITH DISTAL EDGES ADJACENT THE PERIPHERAL WALL OF THE BOWL, THE CONVEYOR ELEMENT HAVING PASSAGE MEANS THROUGH SAID PORTIONS AND OPENINGS FOR SAID PASSAGE MEANS ADJACENT THE DISTAL EDGES IN THE AREA OF THE INWARDLY INCLINED WALL PORTION AND AT A RADIUS GREATER THAN THE RADIUS OF SAID LIQUID DISCHARGE PORT, MEANS FOR FEEDING A TREATING LIQUID TO THE PASSAGE MEANS, WHEREBY TREATING LIQUID CAN BE EFFECTIVELY DELIVERED TO THE DEEP PORTION OF THE SOLIDS LAYER ENGAGED BY THE FLIGHT PORTIONS WHILE THE SOLIDS ARE STILL SUBMERGED AND AS THE SOLIDS APPROACH THE SOLIDS DISCHARGE PORT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |