Patent US3981315A successfully refreshed from Google Patents.
US3981315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stirring apparatus for a liquid tank
Assignee: Alfa Laval NV
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Filing: 1974-09-30
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Granted: 1976-09-21
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Expires: 1994-09-30
Abstract
Abstract The invention relates to a stirring and cleaning apparatus for a liquid tank, e.g. a milk tank, said stirring apparatus comprising a rotatable, motor-driven hollow stirring shaft disposed in the tank, which shaft is provided at the bottom with stirring paddles and at its top is connected to a pipe for pressure liquid and at its bottom being provided moreover with upwardly directed spray orifices.
Inventors
- 👤 Klaas Olthoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:53
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/08; B08B9/0804; B08B9/0813; B01; B01F; B01F25/00; B01F25/20; B01F25/21; B01F25/212; B01F25/2122; B01F25/2125; B01F27/00; B01F27/80; B01F27/90; B08B3/00; B08B3/02; B08B9/093; B01F25/50
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
A stirring apparatus for a liquid tank comprising a rotatingly driven hollow shaft extending downward in the tank, stirring paddles mounted on said shaft and extending radially from the shaft, means for applying a pressurized cleaning fluid into the upper end of the hollow shaft, said hollow shaft extending to adjacent the bottom of the tank, said paddles extending downward to at least the bottom of the shaft, said paddles having cutouts adjacent the bottom of the shaft, spray nozzles disposed on the bottom of the hollow shaft in said cutouts and aligned with said paddles, and said spray nozzles being directed radially outward and upward over the front and back sides of each of the stirring paddles such that the front and back sides of the paddles and the inside of the tank are cleaned by the cleaning liquid as the shaft is rotated.
Claim 2
Dependent Claim
145 words
A stirring apparatus for a liquid tank comprising a rotatingly driven hollow shaft extending downward in the tank, stirring paddles mounted on said shaft and extending radially from the shaft, means for applying a pressurized cleaning fluid into the upper end of the hollow shaft, said hollow shaft extending to adjacent the bottom of the tank, said paddles extending downward to at least the bottom of the shaft, said paddles having cutouts adjacent the bottom of the shaft, spray nozzles disposed on the bottom of the hollow shaft in said cutouts and aligned with said paddles, and said spray nozzles being directed radially outward and upward over the front and back sides of each of the stirring paddles such that the front and back sides of the paddles and the inside of the tank are cleaned by the cleaning liquid as the shaft is rotated.
Claim 3
Dependent Claim
23 words
A stirring apparatus according to claim 1, characterised in that the spray nozzles are provided with slotted openings disposed in a vertical plane.
Claim 4
Dependent Claim
26 words
A stirring apparatus according to claim 1, characterised in that the spread angle of one of the spray nozzles is 90° and of another nozzle 60°.
References Cited (Backward Citations)
US3402725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |