US PATENT SUBCLASS 250 / 338.2
.~.~ Ferroelectric, ferromagnetic, photomagnetic types

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

336.1  DF  INVISIBLE RADIANT ENERGY RESPONSIVE ELECTRIC SIGNALLING {16}
338.1  DF  .~ Infrared responsive {12}
338.2.~.~ Ferroelectric, ferromagnetic, photomagnetic types

DEFINITION

Classification: 250/338.2

Ferroelectric, ferromagnetic, photomagnetic types:

(under subclass 338.1) Subject matter including a material in which (a) the direction of polarization can be reversed by an electric or magnetic field or (b) in which the magnetic permeability can be changed by infrared radiation.

(1) Note. Ferroelectric materials are pyroelectric as well.

SEE OR SEARCH THIS CLASS, SUBCLASS:

338.3, for pyroelectric infrared detectors.

SEE OR SEARCH CLASS

374, Thermal Measuring and Testing,

176+, for temperature measurement with a ferroelectric or ferromagnetic sensor.