×

Method and apparatus for controllably effecting samples using two signals

  • US 6,750,661 B2
  • Filed: 11/12/2002
  • Issued: 06/15/2004
  • Est. Priority Date: 11/13/2001
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of elevating temperature in at least a portion of a fluid-filled channel disposed in a substrate, to a selected elevated temperature, comprising:

  • applying a first selectable current through a fluid in the at least a portion of the fluid-filled channel, the portion of the fluid-filled channel having an electrical resistance;

    applying a second selectable current through the fluid in the at least a portion of the fluid-filled channel, wherein the second selectable current has a different frequency than the first selectable current, detecting at least one characteristic indicative of a temperature of the fluid using the second selectable current; and

    using the one characteristic to control at least one of the selectable current or the electrical resistance to elevate the temperature of the fluid in the portion of the channel to the selected elevated temperature.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×