US PATENT SUBCLASS 33 / 355 R
.~ Magnetic field responsive

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


33 /   HD   GEOMETRICAL INSTRUMENTS

300  DF  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
355 R.~ Magnetic field responsive {6}
356  DF  .~.~> Error indicator, preventor, or compensator {1}
360  DF  .~.~> Utilizing cathode-ray tube or photoelectric cell
361  DF  .~.~> Electro-magnet or inductor (e.g., flux valve, etc.) {1}
363 R  DF  .~.~> Electrical telemetering {5}
364  DF  .~.~> Liquid buoyed magnetic needle
355 D  DF  .~.~> Dip aligning needle

Unofficial Alpha Subclasses: R D

DEFINITION

Classification: 33/355

(under subclass 300) Device comprising means influenced by an external magnetic field, usually that of the earth, and either (1) indicating a direction or deviation from a direction, related to that of the field or (2) controlling a telemetering system to an indicator of such direction or deviation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

310, for a magnetic compass supported on a pendulum for use in a borehole.

313, for means indicating inclination and direction, usually magnetic, of a borehole.

316+, for a gyromagnetic compass.

319, for a gyroscopically stabilized magnetic compass. 352, for a magnetic compass combined with a different directional indicator.

SEE OR SEARCH CLASS

324, Electricity: Measuring and Testing,

259, for testing a magnetic field by using a permanent magnet (e.g., compass needle).

335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,

302+, for permanent magnets of a particular structure or material.