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Positive displacement pump having piston and/or liner with vapor deposited polymer surface

  • US 20040241023A1
  • Filed: 05/27/2003
  • Published: 12/02/2004
  • Est. Priority Date: 05/27/2003
  • Status: Abandoned Application
First Claim
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1. A metering pump for dispensing small, precise volumes of fluid, comprising:

  • a pump housing;

    a chamber within said pump housing, said chamber being bounded by a cylindrical wall within said housing;

    a piston having a cylindrical body portion extending within said chamber, said cylindrical body portion of said piston having a cylindrical outer surface and a duct formed therein;

    two or more passages extending through said pump housing and communicating with said chamber;

    a drive mechanism coupled to said piston for rotating and reciprocating said piston within said chamber;

    said outer surface of said cylindrical body portion of said piston including a surface finish exhibiting a roughness average of at least about four microinches and a vapor deposited polymer.

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