Asymmetrical magnetic stir bar
AssigneeHach Company
InventorBrian Dreiling
Life of this patent
Estimating the term…
Abstract
A magnetic stir bar is described that includes a first portion with an outer perimeter that has a shape in plan view and a center point being a geometric center of the shape. The magnetic stir bar includes a second portion with a magnet that is connected to the first portion. The second portion is arranged so that at least part of the second portion is positioned within the outer perimeter of the first portion and so that a magnetic center point of the magnet in plan view is positioned off-center with respect to the center point of the outer perimeter. A method of mixing a fluid includes providing the fluid in a mixing container with the magnetic stir bar and rotating the magnetic stir bar with a magnetic stirrer.
Claims18
A magnetic stir bar comprising:
- a first portion that defines an outer perimeter that has a shape in plan view with a center point being a geometric center of the shape;
- and
- a second portion that is connected to the first portion and includes a magnet, wherein the second portion is arranged so that (i) at least part of the second portion is positioned within the outer perimeter of the first portion;
- and (ii) a magnetic center point of the magnet in plan view is positioned off-center with respect to the center point of the outer perimeter,
- wherein the second portion is secured to the first portion such that the first portion and second portion are configured to rotate together;
- wherein the magnetic stir bar has only one axis of symmetry when viewed from plan view;
- and
- wherein the magnetic center point is positioned on a neutral line that bisects two poles of the magnet along a length of the magnet in plan view.
A magnetic stir bar comprising:
- a first portion that defines an outer perimeter that has a shape in plan view with a center point being a geometric center of the shape;
- and
- a second portion that is connected to the first portion and includes a magnet, wherein the second portion is arranged so that (i) at least part of the second portion is positioned within the outer perimeter of the first portion;
- and (ii) a magnetic center point of the magnet in plan view is positioned off-center with respect to the center point of the outer perimeter,
- wherein the second portion is secured to the first portion such that the first portion and second portion are configured to rotate together;
- wherein the magnetic stir bar has only one axis of symmetry when viewed from plan view;
- and
- wherein a shape of the first portion is a ring.
A magnetic stir bar comprising:
- a first portion that defines an outer perimeter that has a shape in plan view with a center point being a geometric center of the shape;
- and
- a second portion that is connected to the first portion and includes a magnet, wherein the second portion is arranged so that (i) at least part of the second portion is positioned within the outer perimeter of the first portion;
- and (ii) a magnetic center point of the magnet in plan view is positioned off-center with respect to the center point of the outer perimeter, wherein the second portion is secured to the first portion such that the first portion and second portion are configured to rotate together;
- wherein the magnetic stir bar has only one axis of symmetry when viewed from plan view;
- and
- wherein a plurality of spokes affix the first portion to the second portion.
Dependencies are inferred from the claim text.