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System and method for measuring when fluid has stopped flowing within a line

  • US 6,041,801 A
  • Filed: 07/01/1998
  • Issued: 03/28/2000
  • Est. Priority Date: 07/01/1998
  • Status: Expired due to Term
First Claim
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1. A method for determining when a first fluid having a pressure has stopped flowing within a line, the method comprising:

  • applying a time varying amount of energy to a second fluid separated from the first fluid by a membrane;

    measuring a pressure of the second fluid in response to the applied energy; and

    determining whether the first fluid has stopped flowing based at least on the pressure of the second fluid.

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