Top IPC subclasses
1
|
B03C
|
3
|
magnetic or electrostatic separation of solid materials from solid materials or fluidsseparation by
|
2
|
F28D
|
2
|
heat-exchange apparatus, not provided for in another subclass, in which the heat-exchange media do n
|
3
|
B01D
|
1
|
Separation
|
4
|
F24J
|
1
|
Production or use of heat not otherwise provided for
|
5
|
F03G
|
1
|
spring, weight, inertia, or like motorsmechanical-power-producing devices or mechanisms, not otherwi
|