Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Reexamination Certificate
2006-08-09
2010-06-01
Hendrickson, Stuart (Department: 1793)
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
C423S304000, C423S323000, C423S305000, C023S3130FB
Reexamination Certificate
active
07727497
ABSTRACT:
Disclosed herein are a particle production method whereby spherical fine particles of a crystalline calcium phosphate-based compound can be efficiently produced at low cost, fine particles (especially, spherical particles) with good flowability produced by the particle production method, and a high-quality sintered body obtained by sintering a molded body of the particles. The particle production method comprises a first step of mixing a first substance containing phosphorus and a second substance containing calcium so that the phosphorus and the calcium are present in a predetermined mole ratio and feeding, into a heated atmosphere, droplets of a slurry containing an amorphous reaction product, obtained by the reaction between the first substance and the second substance, to bring the reaction product into a gaseous state; and a second step of crystallizing the reaction product in the gaseous state to obtain particles mainly composed of a calcium phosphate-based compound containing phosphorus and calcium in the predetermined mole ratio. The heated atmosphere preferably contains plasma produced by ionization of an ambient gas.
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Kobayashi Shintaro
Yubuta Kazuhiro
Greenblum & Bernstein P.L.C.
Hendrickson Stuart
Hoya Corporation
Nisshin Engineering Inc.
Rump Richard M
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