US4869656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferromagnetic-fluid pump for pumping biological liquid
Assignee: Dana Transmissions Inc
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Filing: 1987-11-19
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Granted: 1989-09-26
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Expires: 2007-11-19
Abstract
Abstract A ferromagnetic-fluid pump includes a hollow body having a substantially rigid structure and an internal diaphragm dividing said body in two cavities. Each cavity has an inlet and an outlet opening provided with one-way valve. One edge of said diaphragm is hinged on the body structure while its opposite edge is spaced from the adjacent inner surface of said body. Said cavities are partially filled with a ferromagnetic fluid which seals said diaphragm in respect of the inner surface of said body. At least one electric winding is provided onto both sides of said diaphragm and onto the two inner surfaces of said body facing said diaphragm. Said windings are operative to generate a variable magnetic fluid so that said diaphragm oscillates.
Inventors
- 👤 Berardino Della Sala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:39
CPC Classifications
A; A61; A61M; A61M60/00; A61M60/10; A61M60/122; A61M60/196; A61M60/40; A61M60/424; A61M60/457; A61M60/462; A61M60/126; A61M60/148
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
166 words
A ferromagnetic-fluid pump, particulalry one for pumping biological liquids including: a hollow body having an internal diaphragm dividing said hollow body in two cavities, each of said cavities having an inlet and an outlet opening provided with a one-way valve; a feromagnetic fluid partially filling said cavity; at least one electric winding provided onto both the sides of said diaphragm and onto the two inner surfaces of said hollow body facing said diaphragm, said windings being operative to generate a variable magnetic field; wherein: said hollow body has a substantially rigid structure; one edge of said diaphragm is connected to the hollow body structure by means of a pi upon which said diaphragm is hinged and oscillable; the opposite edge of said diaphragm is spaced from the adjacent, inner surface of said hollow body; wherein said pump comprises two pumping chambers, one on either side of said diaphragm, each defined by a flexible bag which separates the volume of the relevant chamber from said ferromagnetic fluid.
Claim 2
Dependent Claim
166 words
A ferromagnetic-fluid pump, particulalry one for pumping biological liquids including: a hollow body having an internal diaphragm dividing said hollow body in two cavities, each of said cavities having an inlet and an outlet opening provided with a one-way valve; a feromagnetic fluid partially filling said cavity; at least one electric winding provided onto both the sides of said diaphragm and onto the two inner surfaces of said hollow body facing said diaphragm, said windings being operative to generate a variable magnetic field; wherein: said hollow body has a substantially rigid structure; one edge of said diaphragm is connected to the hollow body structure by means of a pi upon which said diaphragm is hinged and oscillable; the opposite edge of said diaphragm is spaced from the adjacent, inner surface of said hollow body; wherein said pump comprises two pumping chambers, one on either side of said diaphragm, each defined by a flexible bag which separates the volume of the relevant chamber from said ferromagnetic fluid.
Claim 3
Dependent Claim
61 words
The ferromagnetic-fluid pump according to claim 1, wherein a set of windings is provided on both sides of said diaphragm and on each of the inner surfaces of said hollow body facing said diaphragm, said windings in each set of windings being stepwise energized, from the farthest to the nearest in respect of said pin upon which said diaphragm is oscillable.
Claim 4
Dependent Claim
23 words
The ferromagnetic-fluid pump according to claim 2, wherein a microprocessor controls the stepwise energization of said windings of the relevant set of windings.
Claim 5
Dependent Claim
27 words
The ferromagnetic-fluid pump according to claim 2 wherein a microprocessor controls the intensity of the electric current flowing through said windings and the period of energization thereof.
Claim 6
Dependent Claim
29 words
The ferromagnetic-fluid pump according to claim 1, wherein a portion of said hollow body is to a certain extent elastically deformable outwardly under the action of the internal pressure.
Claim 7
Dependent Claim
21 words
The ferromagnetic-fluid pump according to claim 5, wherein said elastically deformable portion of the hollow body is the bottom wall thereof.
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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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |