USPC Class Details

Description: 392 electric resistance heating devices / 392 electric resistance heating devices/() heating devices (class 219 subclass 200) (441) tank or container type liquid heater (449) line connected tank (458) with external heater (461) with externally mounted circulation-type heater

Hierarchy/Derived subclasses

392 / 441-> 449-> 458-> 461-> 462

uspto searches

Patent Apps in 392/461

Granted Patents in 392/461

Use the links above or do an advanced search in ppubs for:
(392/461.ccls. or 392/462.ccls.)

This will show what classes derive from the input. Ex: entering 43/42.24 shows the derived classes and the search that can be used to find patents or patent applications in those subclasses.
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