Device for delivering charged powder for deposition

A reciprocating particle feed apparatus comprising:

• (1) a deposition chamber;
• (2) a deposition station comprising an opening onto the deposition chamber, into which opening an electrostatic chuck fits, with a deposition surface of the chuck available to the interior of the conduit, the dimensions of the deposition chamber suitable for presenting a deposition effective amount of particles suspended therein within a range of electro-attractive influence at the deposition station;
• and
• (3) at least one piston device comprising a piston and an expansion chamber connected to the deposition chamber, the piston device for maintaining particle suspension in the deposition chamber.

A particle feed apparatus comprising:

• (a) a cylindrical deposition chamber having a center axis;
• and
• (b) a deposition station comprising an opening onto the deposition chamber, into which opening an electrostatic chuck fits, with a deposition surface of the chuck available to the interior of the conduit, the dimensions of the deposition chamber suitable for presenting a deposition effective amount of particles suspended therein within a range of electro-attractive influence at the deposition station;
• wherein the center axis is centered with, and orthogonal to, the opening.