×

Apparatus for conveying liquids

  • US 5,417,663 A
  • Filed: 09/10/1993
  • Issued: 05/23/1995
  • Est. Priority Date: 09/11/1992
  • Status: Expired due to Fees
First Claim
Patent Images

1. A device comprising:

  • a liquid source containing liquid;

    intermittently energizable pump means for drawing liquid to be conveyed from said liquid source to an input of said pump means, said pump means having a pump action causing a substantially fixed amount of said liquid to be drawn in a conveying direction from said liquid source; and

    filter means, connected between said liquid source and said input of said pump means, dimensioned for preventing air bubbles having a larger diameter than a predetermined minimum diameter from freely passing through said filter means and for requiring a pressure needed for conveying through said filter means an air bubble, said air bubble having a larger diameter than said prescribed minimum diameter, said pressure being greater than a maximum pressure drop produced in a pump action by said liquid flowing through said filter means, and said filter means having an admission opening formed by a gap having a length in a direction substantially transverse to said conveying direction giving said gap a volume which is greater than said substantially fixed amount.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×