Patent US5393142A successfully refreshed from Google Patents.
US5393142A
Expired / Lapsed
US
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Impeller for stirring sterile liquids
Assignee: Mavag Verfahrenstechnik AG
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Filing: 1993-09-30
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Granted: 1995-02-28
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Expires: 2013-09-30
Abstract
Abstract An impeller for stirring sterile liquids has a plurality of stirring plates, an impeller head supporting the stirring plates and having an outer surface, a central hollow chamber with an opening, a conduit connecting the central hollow chamber with the outer surface, and a driving pin received in the opening. The impeller head has a lower region provided with a plurality of grooves which during rotation of the impeller head provide an effect of pumping the liquids.
Inventors
- 👤 Hans P. Meier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:47
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: 14
Claim 1
Independent Claim
93 words
An impeller for stirring sterile liquids, comprising a plurality of stirring plates; an impeller head supporting said stirring plates and having a substantially vertical rotary axis, an outer surface, a central hollow chamber with an opening, and a conduit connecting said central hollow chamber with said outer surface; means for driving said impeller head about said rotary axis and including a pin received in said opening, said impeller head having a lower region provided with a plurality of grooves which during rotation of said impeller head provide an effect of pumping a liquid.
Claim 2
Dependent Claim
93 words
An impeller for stirring sterile liquids, comprising a plurality of stirring plates; an impeller head supporting said stirring plates and having a substantially vertical rotary axis, an outer surface, a central hollow chamber with an opening, and a conduit connecting said central hollow chamber with said outer surface; means for driving said impeller head about said rotary axis and including a pin received in said opening, said impeller head having a lower region provided with a plurality of grooves which during rotation of said impeller head provide an effect of pumping a liquid.
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
35 words
An impeller as defined in claim 1, wherein said driving means is formed so as to rotate said impeller head in a direction such as to form a positive pressure in said central hollow chamber.
Claim 6
Dependent Claim
19 words
An impeller as defined in claim 1, wherein at least a part of said central hollow chamber is conical.
Claim 7
Dependent Claim
19 words
An impeller as defined in claim 5, wherein at least a part of said pin has a conical surface.
Claim 8
Dependent Claim
19 words
An impeller as defined in claim 1, wherein at least a part of said pin has a conical surface.
Claim 9
Dependent Claim
19 words
An impeller as defined in claim 1, wherein said conduit is open in a region of said rotary axis.
Claim 10
Dependent Claim
31 words
An impeller as defined in claim 1, wherein said impeller head rotates in a predetermined rotary direction, said conduit being open behind said stirring plates as considered in said rotary direction.
Claim 11
Dependent Claim
38 words
An impeller as defined in claim 1, wherein said impeller head rotates in a predetermined rotary direction and has a plurality of such conduits, said conduits being open behind said stirring plates as considered in said rotary direction.
Claim 12
Dependent Claim
25 words
An impeller as defined in claim 1, wherein said driving means is formed so that a negative pressure is produced in said central hollow chamber.
Claim 13
Dependent Claim
31 words
An impeller as defined in claim 1, wherein said impeller head rotates in a predetermined rotary direction, said conduit being open before said stirring plates as considered in said rotary direction.
Claim 14
Dependent Claim
38 words
An impeller as defined in claim 1, wherein said impeller head rotates in a predetermined rotary direction and has a plurality of such conduits, said conduits being open before said stirring plates as considered in said rotary 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) | 1998-02-27 | 1998-08-29 | 1999-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-27 | 2002-08-29 | 2003-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-27 | 2006-08-29 | 2007-02-28 | $7700.00 | Window Closed / Lapsed |