US3777972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sludge centrifuge
Assignee: Alfa Laval AB
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Filing: 1972-03-17
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Granted: 1973-12-11
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Expires: 1992-03-17
Abstract
Abstract Spaced around the periphery of the centrifugal rotor are permanently open nozzles for discharging sludge separated from the liquid fed to the separating chamber of the rotor. To remove the sludge cushions accumulating on the peripheral wall of this chamber between the permanently open nozzles, the rotor periphery has at least one sludge outlet which is alternately opened and closed by an axially movable piston valve.
Inventors
- 👤 O Kjellgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:41
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/10; B04B1/14; B04B1/16; B04B1/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
95 words
In a centrifuge for separating a sludge-containing liquid, the combination of a centrifugal rotor having a separating chamber and including a peripheral portion, said chamber having permanently open nozzle means leading outward from the chamber periphery for discharging sludge separated therein, said peripheral portion having a sludge outlet opening, and a piston valve movable in the rotor axially thereof between a first position for preventing sludge discharge from said peripheral portion of the chamber except through said nozzle means and a second position for discharging sludge through said outlet opening independently of said nozzle means.
Claim 2
Dependent Claim
95 words
In a centrifuge for separating a sludge-containing liquid, the combination of a centrifugal rotor having a separating chamber and including a peripheral portion, said chamber having permanently open nozzle means leading outward from the chamber periphery for discharging sludge separated therein, said peripheral portion having a sludge outlet opening, and a piston valve movable in the rotor axially thereof between a first position for preventing sludge discharge from said peripheral portion of the chamber except through said nozzle means and a second position for discharging sludge through said outlet opening independently of said nozzle means.
Claim 3
Dependent Claim
16 words
The combination according to claim 1, in which said nozzle means are in the piston valve.
Claim 4
Dependent Claim
19 words
The combination according to claim 1, in which said nozzle means are in said peripheral portion of the rotor.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |