US5407272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double impeller for stirring sterile liquids
Assignee: Mavag Verfahrenstechnik AG
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Filing: 1993-09-30
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Granted: 1995-04-18
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Expires: 2013-09-30
Abstract
Abstract An impeller for stirring has an impeller head having a central hollow chamber with an opening, a stirring tool provided on the impeller head, and a driving pin received in the opening. The stirring tool is formed as a propeller having a rotary direction which produces an upwardly directed flow and provided in a lower region with flow producing surfaces which form an additional flow directed opposite to the flow produced by the propeller.
Inventors
- 👤 Hans P. Meier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:09
CPC Classifications
B; B01; B01F; B01F33/00; B01F33/45; B01F33/453; B01F33/4535; B01F35/00; B01F35/40; B01F35/41; B01F35/411; B01F35/4112
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
123 words
An impeller for stirring, comprising a stirring tool; a rotatable impeller head having a substantially vertical axis of rotation and carrying said stirring tool to rotate the latter; means for rotatably driving said impeller head about said axis of rotation, said stirring tool having a plurality of propeller blades arranged so that during rotation of said stirring tool a liquid flow is produced in a predetermined direction, said impeller head having a lower region provided with a flow producing surface formed so that an additional flow is provided which is directed opposite to said flow produced by said propeller blades, said impeller head having a hollow chamber and an outer surface, and a conduit which connects said hollow chamber with said outer surface.
Claim 2
Dependent Claim
123 words
An impeller for stirring, comprising a stirring tool; a rotatable impeller head having a substantially vertical axis of rotation and carrying said stirring tool to rotate the latter; means for rotatably driving said impeller head about said axis of rotation, said stirring tool having a plurality of propeller blades arranged so that during rotation of said stirring tool a liquid flow is produced in a predetermined direction, said impeller head having a lower region provided with a flow producing surface formed so that an additional flow is provided which is directed opposite to said flow produced by said propeller blades, said impeller head having a hollow chamber and an outer surface, and a conduit which connects said hollow chamber with said outer surface.
Claim 3
Dependent Claim
16 words
An impeller as defined in claim 1, wherein said driving means are contactless inductive driving means.
Claim 4
Dependent Claim
16 words
An impeller as defined in claim 1, wherein said driving means are contactless magnetic driving means.
Claim 5
Dependent Claim
24 words
An impeller as defined in claim 1, wherein said flow-producing surfaces are formed as vanes provided on a lower surface of said impeller head.
Claim 6
Dependent Claim
24 words
An impeller as defined in claim 1, wherein said flow producing surfaces are formed as a turbine-shaped lower end surface of said impeller head.
Claim 7
Dependent Claim
38 words
An impeller as defined in claim 1, wherein said impeller head has a lower end surface, said stirring tool being spaced from said lower end surface by a distance equal to 1/2 of a propeller blades outer diameter.
Claim 8
Dependent Claim
17 words
As defined in claim 6, wherein said distance is equal to 11/2 the propeller blades outer diameter.
Claim 9
Dependent Claim
31 words
An impeller as defined in claim 1; and further comprising a pin extending into an interior of said impeller head and rotatably supporting said impeller head for rotation about said axis.
Claim 10
Dependent Claim
49 words
An impeller as defined in claim 1, wherein said propeller blades are formed so that the flow produced by the propeller blades is directed upwardly, said flow producing surfaces of said impeller head being formed so that the additional flow produced by said flow producing surfaces is directed downwardly.
Claim 11
Dependent Claim
49 words
An impeller as defined in claim 1, wherein said propeller blades are formed so that the flow produced by the propeller blades is directed upwardly, said flow producing surfaces of said impeller head being formed so that the additional flow produced by said flow producing surfaces is directed laterally.
Claim 12
Dependent Claim
39 words
An impeller as defined in claim 1, wherein said means for rotatably driving said impeller head include a drive shaft and magnetic means for transmitting a rotation of said drive shaft to said impeller head in a contactless manner.
Claim 13
Dependent Claim
41 words
An impeller as defined in claim 1, wherein said stirring tool rotates in the rotary direction, said propeller blades of said stirring tool being inclined relative to said rotary direction so as to provide the liquid flow in said predetermined direction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-17 | 1998-10-17 | 1999-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-17 | 2002-10-17 | 2003-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-17 | 2006-10-17 | 2007-04-18 | $7700.00 | Window Closed / Lapsed |