US PATENT SUBCLASS 361 / 143
.~ Systems for magnetizing, demagnetizing, or controlling the magnetic field

Current as of: June, 1999
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361 /   HD   ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES

139  DF  CONTROL CIRCUITS FOR ELECTROMAGNETIC DEVICES {7}
143.~ Systems for magnetizing, demagnetizing, or controlling the magnetic field {5}
144  DF  .~.~> For lifting or holding {1}
146  DF  .~.~> Systems for magnetic field stabilization or compensation
147  DF  .~.~> With permanent magnet {1}
149  DF  .~.~> Demagnetizing {2}
152  DF  .~.~> Including particular drive circuit {3}

DEFINITION

Classification: 361/143

Systems for magnetizing, demagnetizing or controlling the magnetic field:

(under subclass 139) Subject matter including systems and processes for magnetizing, demagnetizing or effecting a magnetic field by means of controlled energization or deenergization of an electromagnetic coil.

(1) Note. This subclass includes, for example, processes for demagnetizing the hair springs of a watch and systems for supplying energy to a demagnetizing coil.

(2) Note. Where the demagnetizing is combined with the specific features of the art environment, the search should extend to the class which relates to the art environment.