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Parameter end point measuring device

  • US 5,801,968 A
  • Filed: 04/23/1996
  • Issued: 09/01/1998
  • Est. Priority Date: 04/23/1996
  • Status: Expired due to Term
First Claim
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1. A monitor device for determining an end point measurement of a changing environmental parameter comprising:

  • a. a probe, said probe quantitatively measuring consecutive values of the environmental parameter;

    b. transducing means for converting said measured values of the environmental parameter and converting said values into electrical signals;

    c. clock means for determining a time window;

    d. memory means for storing a selected minimum slope value of the difference between an initial environmental parameter value and a selected subsequent value measured by said probe and said time window;

    e. end point selection means for repeatedly comparing, during an initial time interval, said selected minimum slope within said time window in said memory to an actual slope of an actual environmental parameter value measured by said probe within said time window, and for producing a display signal indicating the end point measurement when said actual slope is less than or equal to said selected minimum slope; and

    f. display means for exhibiting indicia representing said actual environmental parameter.

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