US PATENT SUBCLASS 60 / 657
.~ Having apparatus cleaning, sealing, lubricating, purging, standby, or protecting feature

Current as of: June, 1999
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60 /   HD   POWER PLANTS

643  DF  MOTIVE FLUID ENERGIZED BY EXTERNALLY APPLIED HEAT {11}
657.~ Having apparatus cleaning, sealing, lubricating, purging, standby, or protecting feature {1}
658  DF  .~.~> Damage to heat receiving element prevented by automatic means maintaining minimum flow

DEFINITION

Classification: 60/657

(under subclass 643) Apparatus, having as perfecting features structure by which (1) the apparatus is cleaned, (2) unwanted fluids are discharged from the system (3) the system is lubricated (4) the apparatus is held on standby for ease of restarting; or (5) the apparatus is protected from damage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

645+, for a process of operating a heat energized power plant including a startup, shutdown, cleaning, protective or maintenance procedure.

SEE OR SEARCH CLASS

122, Liquid Heaters and Vaporizers,

379+, for a boiler with cleaning structure; and subclasses 504+, for a boiler having safety devices.

184, Lubrication, appropriate subclass for a lubrication system, per se. 236, Automatic Temperature and Humidity Regulation,

21, for a safety cutout for a closed fluid heater.

415, Rotary Kinetic Fluid Motors or Pumps,

110+, for a turbine having a lubricating, sealing, packing or bearing means with an internal working fluid connection.