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Precision fluid dispensing system

  • US 6,739,478 B2
  • Filed: 06/25/2002
  • Issued: 05/25/2004
  • Est. Priority Date: 06/29/2001
  • Status: Expired due to Fees
First Claim
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1. A precision fluid dispensing system comprising:

  • a two-piece pump having a two or more diameter piston disposed in an outer cylinder, said outer cylinder having a same number of diameters as said piston, said pump also having a plurality of input and output ports attached to said outer cylinder and defined by said piston and said cylinder;

    a fixed frame attached to said outer cylinder, said fixed frame rigidly holding said outer cylinder;

    a sliding frame attached to said piston, said sliding frame moving in relation to said fixed frame, said sliding frame displacing said piston by said movement;

    a first motor attached to said sliding frame, said first motor coupled to said piston causing said piston to rotate between a plurality of port positions;

    a second motor attached to said fixed frame, said second motor causing said sliding frame to move in relation to said fixed frame, whereby said sliding frame displaces said piston;

    a closed loop feedback control system with an input and an output, said input proportional to said piston'"'"'s position, said output controlling said second motor, whereby said closed loop feedback control system allows displacement of said piston to precisely dispense a predetermined amount of fluid.

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