Patent ID: 6274121
Filing Date: 2001-08-14
Classification: A61K,B03C,B82Y,G01N,H01F,Y10S

Abstract:
Superparamagnetic particles, consisting of particles selected from the group consisting of(a) small superparamagnetic one-domain particles of iron hydroxide, iron oxide hydrate, iron oxide, mixed iron oxide or iron with a particle size ranging between 3 and 50 nanometers;(b) dispersion stable, physiological degradable aggregates with a particle size ranging between 10 and 1000 nanometers, whereby the aggregate consists of several small superparamagnetic one-domain particles of iron hydroxide, iron oxide hydrate, iron oxide, mixed iron oxide or iron with a particle size ranging between 3 and 50 nanometers; andthe mixtures of (a) and (b);wherein to the surfaces of the particles or aggregates or mixtures thereof are bound as stabilizer substances(c) inorganic condensation products of ortho-phosphoric acid or meta-phosphoric acid.