US 6,183,169 B2 · Precision dispensing of ultra-fines via a gas medium

Abstract

A dispensing apparatus for the dispensing of ultra-fine particles on a dry basis in a reproducible manner. The apparatus includes a first gas-solids suspension chamber having particle fluidization means adapted thereto, and a conduit adapted between the first gas-solids chamber and a second gas-solids chamber for communicating via at least one particle orifice particles between the chambers. A high velocity gas stream provides a pressure difference between the chambers whereby a low pressure zone is created within the conduit thereby drawing in particles from the first gas-solids suspension chamber into the second gas-solids suspension chamber via the conduit. The apparatus further includes a combination of a withdrawal feed and a solenoid valve to direct particles from the second gas-solids suspension chamber into a collection area.

Claims13

Dependent claims

Apparatus which dispenses dry particles, comprising:

a first-stage gas-solids fluidization chamber and at least one second-stage gas-solids fluidization chamber, each first-stage said first-stage and said at least one and second-stage chamber having particle fluidization means for creating a suspension of said particles within said chambers;
for each said second-stage chamber, a conduit connected for suspended particles to flow from said first-stage chamber to said second-stage chamber for suspension in said second-stage chamber;
means for providing a pressure drop from said first-stage chamber to each said second-stage chamber, to produce said flow of suspended particles from said first-stage chamber to said second-stage chamber;
and,
for each said second-stage chamber, means for withdrawing suspended particles from said at least one second-stage chamber into at least one collection area.

2 more elements

Dependencies are inferred from the claim text.

Precision dispensing of ultra-fines via a gas medium

Life of this patent

Precision dispensing of ultra-fines via a gas medium

Life of this patent

Abstract

Claims13