(under subclass 129) Subject matter in which the storage medium is an electret, that is, an element which exhibits a permanent external electrostatic field due to internal polarization.
SEE OR SEARCH THIS CLASS, SUBCLASS:
145, for ferroelectric storage systems.
147, for persistent internal polarization devices.
SEE OR SEARCH CLASS
307, Electrical Transmission or Interconnection Systems,
400, for electrets used in saturable reactor systems.
