(under subclass 139) Subject matter utilizing electromagnetic devices or control circuit conductors which are superconductive.
(1) Note. Superconductivity is a property possessed by some metals, alloys, and compounds when their temperature is reduced to within a few degrees of absolute zero. There is a steady fall of resistance with temperature in these materials until a critical temperature (transition temperature) is reached, and then the resistance falls suddenly to zero or practically to zero.
150+, for high temperature (Tc 30 K) superconducting systems or devices, subclass 192 for capacitors having high temperature superconducting materials, and cross-reference art collections in subclass 851 for control circuits for electromagnetic devices that are superconductive, or that control superconductive devices.
