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Precision micro-liter drop dispenser

  • US 4,927,062 A
  • Filed: 09/22/1988
  • Issued: 05/22/1990
  • Est. Priority Date: 09/22/1988
  • Status: Expired due to Fees
First Claim
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1. A dropper tip for the drop-wise dispensing of a liquid in drop volumes of less than 20 μ

  • l volumes from a container, comprising;

    a dispensing stem having a cylindrical lumen therethrough formed along an axis from a liquid entry port at one end to an exit port at the other end, the lumen defined by a surface of revolution about the axis; and

    a fitment intermediate the ends of said dispensing stem for engaging a neck of a container to position one portion of said dispensing stem and said entry port in the interior of the liquid container and to position the remaining portion of the dispensing stem and said exit port exteriorly of the container;

    said entry port defined by a frusto-conical surface formed about the axis, the lumen extending along the axis through said frusto-conical surface to define a circular rim at the intersection of said frusto-conical surface and said surface of revolution, the circular rim having a minimum contact surface at said entry port to minimize surface area for the adhesion of bubbles at or adjacent to said entry port.

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