Liquid level indicator
OwnerWade L. Donehueinventor
Life of this patent
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Abstract
A magnetically operated liquid level indicator of the kind having a magnetized float which moves as the level of liquid changes is disclosed. The indicator has a plurality of magnetized indicator elements disposed one above the other and past which the magnetized float travels as the liquid level rises or falls. The indicator elements are rotatable under the influence of the magnetized float. Weakly magnetized, closely spaced, long, one-piece ceramic magnets are employed as the indicator elements.
Claims5
A longitudinally elongated indicator flag formed from a magnetized ceramic composite material selected from the group consisting of BaFe2O3 and SrFe2O3 having a flux density in the range of from about 20 to about 200 Gauss and a saturation limit in the range of from about 400 to about 1200 Gauss, said longitudinally elongated indicator flag having a first end, a second end, a longitudinal axis, a generally rectangular cross section transverse to the longitudinal axis, and defining a borehole extending along its longitudinal axis from the first end to the second end, wherein the first end of the indicator flag defines a generally planar first end surface first portion onto which the borehole opens and a generally planar first end surface second portion which is longitudinally spaced from the first portion surface, and a generally cylindrical first end surface third portion which is radiused around the borehole and connects the first portion and the second portion.
Dependencies are inferred from the claim text.