Plastic and nonmetallic article shaping or treating: processes – Flame contact or reshaping by heat decomposition of work
Reexamination Certificate
2005-09-07
2010-11-09
Theisen, Mary Lynn F (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Flame contact or reshaping by heat decomposition of work
C264S005000, C264S015000, C425S006000, C425S010000
Reexamination Certificate
active
07828999
ABSTRACT:
A fine particle producing process introduces a material for producing fine particles into a thermal plasma flame to make a vapor-phase mixture and quenches the vapor-phase mixture to form the fine particles. In the process, the material for producing the fine particles is dispersed or dissolved in a dispersion medium or solvent, preferably containing a combustible material to prepare a dispersion such as a slurry, a colloidal solution or a dissolution solution, the dispersion is made into a form of droplets, or the material for producing the fine particles is dispersed with a carrier gas and a combustible material and the dispersion in a droplet form or the dispersed material is introduced into the thermal plasma flame. In the fine particle producing process and apparatus, a gas of an amount sufficient to quench the vapor-phase mixture is supplied toward a tail of the thermal plasma flame. In the process and apparatus, primary fine particles are introduced into a cyclone to be subjected to cooling and classification and secondary fine particles having a particle size of 100 nm or less which are left upon removal of coarse particles are recovered.
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Japanese Office Action
Japanese Office Action and partial English translation.
Fujii Takashi
Nakamura Keitaroh
Yubuta Kazuhiro
Nisshin Engineering Inc.
Nisshin Seifun Group Inc.
Theisen Mary Lynn F
Whitman Curtis Christofferson & Cook, P.C.
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