US PATENT SUBCLASS 166 / 272.3
.~.~.~ Steam as drive fluid

Current as of: June, 1999
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166 /   HD   WELLS

244.1  DF  PROCESSES {39}
268  DF  .~ Distinct, separate injection and producing wells {7}
272.1  DF  .~.~ Involving the step of heating {4}
272.3.~.~.~ Steam as drive fluid {2}
272.4  DF  .~.~.~.~> In combination with alkyls or carbon chains
272.5  DF  .~.~.~.~> With override zone, diverting, or path blocking operation

DEFINITION

Classification: 166/272.3

Steam as drive fluid:

(under subclass 272.1) Heating utilizing high temperature water vapor.

SEE OR SEARCH CLASS

60, Power Plants,

643+, for motive fluid energized by externally applied heat.

91, Motors: Expansible Chamber Type,

152+, for steam engines.

122, Liquid Heaters and Vaporizers, 35, for boiler steam storage, 379+ for cleaning, and 459+ for steam treatment.

159, Concentrating Evaporators,

16.1+, for gaseous blast or current (fluid steam injection).

165, Heat Exchange,

110+, for first fluid holder or collector open to second fluid (steam vapor condenser).

261, Gas and Liquid Contact Apparatus, digest 10 for steam heaters and condensers.