Chemistry: analytical and immunological testing – Tracers or tags
Patent
1997-04-04
1999-12-21
Ludlow, Jan
Chemistry: analytical and immunological testing
Tracers or tags
73779, 32420721, 32420722, 324209, 324219, 436149, G01N 2772
Patent
active
060048174
ABSTRACT:
A method for measuring the level of stress in a polymeric or pre-polymeric composition within a given volume that includes combining the polymeric or pre-polymeric composition with a plurality of microparticles having a non-ferromagnetic or non-ferrimagnetic core provided with a coating that is ferromagnetic or ferrimagnetic to form an admixture in which the microparticles are substantially uniformly dispersed throughout the composition. The microparticles have a detectable magnetic characteristic which correlates with level of stress in the composition within a given volume. The change in the magnetic characteristic of the microparticles is then measured to determine the level of stress in the composition within a given volume.
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Chamberlain Craig S.
Feyma Dean E.
Heilig Steven J.
Yorkgitis Elaine M.
3M Innovative Properties Company
Ludlow Jan
Szymanski Brian E.
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