US PATENT SUBCLASS 29 / 890.03
.~ Heat exchanger or boiler making

Current as of: June, 1999
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29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
890.03.~ Heat exchanger or boiler making {15}
890.031  DF  .~.~> Repairing, converting, servicing or salvaging
890.032  DF  .~.~> Heat pipe device making
890.033  DF  .~.~> Solar energy device making
890.034  DF  .~.~> Regenerator or recuperator making
890.035  DF  .~.~> Cooling apparatus making, e.g., air conditioner, refrigerator
890.036  DF  .~.~> Tube inside tube
890.037  DF  .~.~> Tube wound about tube
890.038  DF  .~.~> Tube joined to flat sheet longitudinally, i.e., tube sheet
890.039  DF  .~.~> Sheet joined to sheet {2}
890.043  DF  .~.~> Tube joint and tube plate structure {1}
890.045  DF  .~.~> Tube with heat transfer means {1}
890.051  DF  .~.~> Boiler making
890.052  DF  .~.~> Header or manifold making
890.053  DF  .~.~> Tube making or reforming
890.054  DF  .~.~> With metallurgical bonding

DEFINITION

Classification: 29/890.03

Heat exchanger or boiler making:

(under subclass 592) Process for manufacturing (1) a water heater for generating steam or (2) an article especially useful for recovery of thermal energy or for transferring thermal energy from one fluid to another fluid or to the environment.

(1) Note. This subclass and the subclasses indented hereunder include a method of making a subcombination not elsewhere provided for, which are especially useful in heat exchanger or boiler devices.

(2) Note. Prior to the establishment of these subclasses (890.03+), this subject matter was indented under "Gas and Water Device Making" (old 29/157+). Other subclasses under Class 29, subclasses 592+ have not been screened for this subject matter.

(3) Note. Making a heat sink device, per se, or heat absorbing material, per se, is not included in this subclass or indented subclasses.

SEE OR SEARCH CLASS

73, Measuring and Testing, especially

112+, for testing power plant or unit efficiency, subclasses 116+ for testing a motor or engine and subclasses 700+ for a fluid pressure gauge, generally.

110, Furnaces, for a heating system, generally. 122, Liquid Heaters and Vaporizors, for a heating unit specific to that class.

126, Stoves and Furnaces, for a heating unit, generally.

137, Fluid Handling, for a fluid system, generally.

156, Adhesive Bonding and Miscellaneous Chemical Manufacture,

60+, for a method of making a heat exchanger or boiler by means of adhesive or nonmetallic bonding where no metalworking takes place.

159, Concentrating Evaporators, for an evaporator for cooling, and Digest 18 an art collection specific to an accumulator.

205, Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions,

73, for an electrolytic method of making a hollow body such as a heat exchanger or boiler.

264, Plastic and Nonmetallic Article Shaping or Treating: Processes, appropriate subclass for a process of shaping or treating nonmetallic material under the class definition.