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Apparatus for and method of controlling the opening and closing of channel for liquid

  • US 4,989,626 A
  • Filed: 11/08/1989
  • Issued: 02/05/1991
  • Est. Priority Date: 11/11/1988
  • Status: Expired due to Term
First Claim
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1. A method of controlling the opening and closing of a channel for a liquid, comprising the steps of:

  • cooling said liquid in said channel from the outside of said channel to solidify said liquid, thereby closing said channel; and

    heating said channel from the outside thereof to melt said liquid solidified in said channel, thereby opening said channel.

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