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Smoke generator and toy smoke-ring gun using same

  • US 6,421,502 B1
  • Filed: 12/07/2000
  • Issued: 07/16/2002
  • Est. Priority Date: 12/07/2000
  • Status: Expired due to Term
First Claim
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1. A smoke generator comprising:

  • a) a supply tank that holds the liquid, b) a source of variable fluid pressure in sealed fluid communication with the supply tank for increasing and decreasing fluid pressure in the tank to feed the liquid to and from a heating unit;

    c) a first tube with a first end entering into the supply tank, and a second smoke outlet end; and

    d) a heater positioned at least partially within the first tube for vaporizing the pressurized liquid driven by an increase in the pressure into a narrow annular region between the heating element and the surrounding tube.

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