US PATENT SUBCLASS 237 / 80
ANTIFREEZING DEVICES
Current as of: June, 1999
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DEFINITION
Classification: 237/80
(under the class definition) Devices for preventing freezing in heating conduits or other hollow heaters or for thawing out heating conduits not provided for in other classes.
SEE OR SEARCH CLASS
137, Fluid Handling, for fluid handling systems including means to prevent freezing see particularly
59+, 301+ and 375.
138, Pipes and Tubular Conduits,
32+, for antifreezing devices for pipes of general utility, though intended to be used in a heating system. 428, Stock Material or Miscellaneous Articles, appropriate subclasses, for a stock material product in the form of a single or plural layer web or sheet, and especially
304.4+, for such a product embodying a component which is porous or cellular.
