US3689033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic stirrer device
Assignee: Pfizer Health AB
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Filing: 1970-08-10
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Granted: 1972-09-05
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Expires: 1990-08-10
Abstract
Abstract A magnetic stirrer device comprising a transversally magnetized rod disposed in a mixing chamber and means for generating an alternating transversal magnetic field within the chamber so as to obtain a rotation of the rod and a stirring of the fluids in the chamber.
Inventors
- 👤 Ola Ragnar Holmstrom
- 👤 Kurt Ake Lundin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:58
CPC Classifications
B; B01; B01F; B01F33/00; B01F33/45; B01F33/452; B01F35/00; B01F35/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
Magnetic stirrer device for stirring a liquid flow, said device comprising a tubular mixing chamber which is coaxial with said flow, a feed means for supplying the components of said flow to one end of said tubular mixing chamber, a discharge means for discharging said flow from the other end of said tubular mixing chamber, a magnetic stirrer located in said tubular mixing chamber and formed by a transversally magnetized rod which is coaxial with said chamber, and means outside of said chamber for generating an alternating magnetic field in said chamber so as to rotate said magnetic stirrer around an axis parallel to the longitudinal axis of said tubular mixing chamber.
Claim 2
Dependent Claim
112 words
Magnetic stirrer device for stirring a liquid flow, said device comprising a tubular mixing chamber which is coaxial with said flow, a feed means for supplying the components of said flow to one end of said tubular mixing chamber, a discharge means for discharging said flow from the other end of said tubular mixing chamber, a magnetic stirrer located in said tubular mixing chamber and formed by a transversally magnetized rod which is coaxial with said chamber, and means outside of said chamber for generating an alternating magnetic field in said chamber so as to rotate said magnetic stirrer around an axis parallel to the longitudinal axis of said tubular mixing chamber.
Claim 3
Dependent Claim
49 words
The device of claim 1 wherein said alternating magnetic field generating means comprises an oscillator connected to coils on a magnetic core, the pole pieces of said core being spaced around said chamber, and said oscillator having an adjustable frequency, and wherein only one transversally magnetized rod is used.
Claim 4
Dependent Claim
18 words
The device of claim 1 wherein said transversally magnetized rod is provided on each end with a protrusion.
Claim 5
Dependent Claim
18 words
The device of claim 3 wherein said protrusions on each end of said transversally magnetized rod are vanes.
Claim 6
Dependent Claim
16 words
The device of claim 1 wherein the transversally magnetized rod has a screw shaped outer surface.
Claim 7
Dependent Claim
14 words
The device of claim 1 wherein the transversally magnetized rod is a bored rod.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |