US PATENT SUBCLASS 60 / 691
.~.~ Boiler feed water heated by exhaust

Current as of: June, 1999
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685  DF  MOTOR HAVING EXHAUST FLUID TREATING OR HANDLING MEANS {6}
690  DF  .~ Motor and indirect heat exchanger {3}
691.~.~ Boiler feed water heated by exhaust

DEFINITION

Classification: 60/691

(under subclass 690) Apparatus, in which the heat exchange is between motor exhaust steam and water being prepared for introduction into a boiler that feeds steam to the motor.

SEE OR SEARCH THIS CLASS, SUBCLASS:

678, for a boiler motor assembly in which boiler feed water is heated in stages by steam withdrawn between motor sections of serially connected motor sections.

SEE OR SEARCH CLASS

122, Liquid Heaters and Vaporizers,

412+, for a boiler feed heater combination. 165, Heat Exchange, appropriate subclass for a heat exchanger, per se.