US3680843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic mixer for discrete sample systems
Assignee: Beckman Coulter Inc
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Filing: 1970-06-18
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Granted: 1972-08-01
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Expires: 1990-06-18
Abstract
Abstract There is disclosed a sample mixing system having a multiplicity of sample containers into which are inserted magnetic stirring rods. Each of a pair of pole pieces is connected to an alternating current electromagnet between which pole pieces the sample containers are positioned to intercept the alternating magnetic field generated by the electromagnet causing the magnetic stirring rods to move, thereby stirring the contents of the containers.
Inventors
- 👤 Maoyeh Lu
- 👤 Nico J Van Slooten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:33
CPC Classifications
B; B01; B01F; B01F33/00; B01F33/45; B01F33/452
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
In a discrete liquid sample analyzer of the type wherein liquids to be analyzed must be thoroughly agitated, a magnetic mixing system comprising: a two pole electromagnet having a multiplicity of turns of alternating current conducting wire for generating an alternating magnetic field; a pole piece fastened one to each pole of said electromagnet, each of the pole pieces having a plurality of uniformly spaced fingers, said pole pieces being oppositely disposed to form a corresponding plurality of air gaps between said fingers through which air gaps said alternating magnetic field is directed; a multiplicity of sample cells into which the liquids to be analyzed are placed, one of said cells being positioned in each of the air gaps between said pole pieces; and a plurality of magnetic stirring rods, one of said rods being placed within each of said sample cells, each rod being rotated in response to said alternating magnetic field to mix the contents of said multiplicity of sample cells.
Claim 2
Dependent Claim
163 words
In a discrete liquid sample analyzer of the type wherein liquids to be analyzed must be thoroughly agitated, a magnetic mixing system comprising: a two pole electromagnet having a multiplicity of turns of alternating current conducting wire for generating an alternating magnetic field; a pole piece fastened one to each pole of said electromagnet, each of the pole pieces having a plurality of uniformly spaced fingers, said pole pieces being oppositely disposed to form a corresponding plurality of air gaps between said fingers through which air gaps said alternating magnetic field is directed; a multiplicity of sample cells into which the liquids to be analyzed are placed, one of said cells being positioned in each of the air gaps between said pole pieces; and a plurality of magnetic stirring rods, one of said rods being placed within each of said sample cells, each rod being rotated in response to said alternating magnetic field to mix the contents of said multiplicity of sample cells.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |