Method for determining the presence of a magnetically...

Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen

Reexamination Certificate

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Reexamination Certificate

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11211774

ABSTRACT:
The present invention is based on the recognition that some materials contain a magnetically susceptible or magnetic component. That is, they exhibit ferromagnetic, paramagnetic, diamagnetic or magnetic properties. According to the invention, it is possible to determine the presence of a magnetically susceptible or magnetic component in a sample of a material by obtaining a sample of the material, positioning the sample at a predetermined distance from a magnet and then measuring the magnetic force on the sample by the magnet. The force is measured using a force transducer. To obtain the magnetic force per unit gravitational force, the gravitational force on the sample is measured out of the presence of the magnet and the measured magnetic force is then divided by the gravitational force exerted on the sample. A sample thickness adjustment is necessary if comparing samples of different thicknesses.

REFERENCES:
patent: 3620316 (1971-11-01), Henry et al.
patent: 6100687 (2000-08-01), Weitekamp et al.
patent: 6605941 (2003-08-01), Abe
patent: 2003/0224366 (2003-12-01), Weindel et al.
patent: 11183238 (1999-07-01), None

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