US PATENT SUBCLASS 324 / 200
MAGNETIC

Current as of: June, 1999
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324 /   HD   ELECTRICITY: MEASURING AND TESTING

200MAGNETIC {24}
201  DF  .~> Susceptibility
202  DF  .~> Calibration
203  DF  .~> Curie point determination
204  DF  .~> Fluid material examination
205  DF  .~> Permanent magnet testing
206  DF  .~> Movable random length material measurement
207.11  DF  .~> Displacement {7}
209  DF  .~> Stress in material measurement
210  DF  .~> Magnetic information storage element testing {2}
213  DF  .~> Magnetic recording medium on magnetized object records object field
214  DF  .~> By paramagnetic particles {2}
217  DF  .~> Railroad rail flaw testing {1}
219  DF  .~> Magnetic sensor within material {1}
222  DF  .~> Hysteresis or eddy current loss testing
223  DF  .~> Hysteresis loop curve display or recording
224  DF  .~> With temperature control of material or element of test circuit
225  DF  .~> With compensation for test variable
226  DF  .~> Combined
227  DF  .~> Plural tests
228  DF  .~> With means to create magnetic field to test material {5}
244  DF  .~> Magnetometers {14}
260  DF  .~> Magnetic field detection devices {1}
262  DF  .~> Magnetic test structure elements
263  DF  .~> Current through test material forms test magnetic field

DEFINITION

Classification: 324/200

MAGNETIC:

(under the class definition) Subject matter which includes apparatus to sense and indicate the sensing of a magnetic field and elements or subcombinations of apparatus to sense and indicate the sensing of the magnetic field where not elsewhere provided.

(1) Note. Method claims pertaining to the subject matter of this group of subclasses will be placed with the corresponding apparatus subclasses.

(2) Note. The term "elements" includes magnetic sensors, per se, and energized sensors not provided for in another class.

(3) Note. The apparatus to indicate includes a visible or latent recording of the result of a magnetic field sensing.

(4) Note. The magnetic field sensed may be a portion of a magnetic field or a portion of a magnetic field in a material.

(5) Note. Included in this group of subclasses are: the measuring or testing of magnetic fields, the measuring, testing, or sensing of material of metal or nonmetal by means of magnetic fields for electrical, magnetic, and other properties of the material, subcombinations of the apparatus to measure or test magnetic fields or materials by magnetic fields not provided for elsewhere, magnetic field sensors not classified elsewhere, supports for material tested by magnetic fields, and supports for magnetic field sensing devices.

(6) Note. This is the generic subclass for the location, identification, or testing of (1) metal ores, (2) unwanted metals, or (3) the presence of metal in a nonmetal environment. In these cases the metal is located, identified, or tested by its interaction with a magnetic field.

SEE OR SEARCH THIS CLASS, SUBCLASS: 51, for short or open coil tests, the number of coil turns

tests, and coil polarity tests.

55, for transformer properties testing. 300+, for nuclear or electronic testing. 323+, for geophysical subsurface and surface testing. 376+, for core sample magnetic orientation testing.

SEE OR SEARCH CLASS

164, Metal Founding,

450.5, for a metal casting apparatus including control means influenced by a magnetic sensor.

209, Classifying, Separating, and Assorting Solids,

8, for magnetizing or demagnetizing precedent to a separation, subclasses 38+ for the combination of a magnetic separation with another physical separation of a solid from a solid, subclasses 72+ for the magnetic testing and separation of objects from other objects, and subclasses 212+ for the separation of material by magnetic separation.

250, Radiant Energy,

250+, for the detection of invisible electromagnetic energy and the testing of material by invisible electromagnetic radiation, subclasses 493.1+ for radiant energy generation and sources, and subclasses 505.1+ for radiation controlling means.

331, Oscillators,

44, for oscillators with frequency calibration or testing. 343, Communications: Radio Wave Antenna,

17.7, for radar systems with testing or calibrating, and subclass 703 for antennas with means to measure radiated antenna signal energy.

356, Optics: Measuring and Testing,

33+, for the measurement of distance by light, subclasses 300+ for the examination of visible light by spectros-copy, subclasses 138+ for angle or axial alignment testing, subclasses 372+ for mensuration or configuration comparison, subclasses 401+ for color tests, and subclasses 213+ for the examination of visible light generally.

360, Dynamic Magnetic Information Storage or Retrieval,

31, for monitoring or testing the progress of recording.

455, Telecommunications,

67.1+, 115, and 226.1+ for measuring and testing of

communication equipment.