US PATENT SUBCLASS 33 / 300
INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA

Current as of: June, 1999
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300INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
301  DF  .~> Process {2}
304  DF  .~> Borehole direction or inclination {6}
315  DF  .~> Thermally sensitive
316  DF  .~> Gyromagnetic compass {1}
318  DF  .~> Gyroscopically controlled or stabilized {5}
331  DF  .~> With recorder
332  DF  .~> With marker
333  DF  .~> Structurally installed including relation to feature thereof {1}
335  DF  .~> Vehicle running gear, or headlight, inclination {2}
338  DF  .~> Railway rail spacing and inclination
339  DF  .~> With cord-type straight-line guide or holder therefor
340  DF  .~> With measurement in plural directions or of shape {1}
342  DF  .~> With independent linear measurement
343  DF  .~> With angle or shape determination
344  DF  .~> With damper or governor for sensor {2}
347  DF  .~> Attaching means (i.e., adhesive, magnetic or vacuum viewing aid)
348  DF  .~> With viewing aid (i.e., illuminator or illumination director) {1}
349  DF  .~> With preselected direction indicator
350  DF  .~> With protector or shock absorber
351  DF  .~> Diverse directional indicator {2}
354  DF  .~> Combined
355 R  DF  .~> Magnetic field responsive {6}
365  DF  .~> Level or plumb, terrestrial gravitation responsive {9}

DEFINITION

Classification: 33/300

(under the class definition) Device or method for indicating a direction related to that of some force (e.g., magnetic field, gravity etc.), of the type which will pass through a natural media (e.g., air, earth, water), the media apparently being passive to such passage, and not elsewhere classified.

SEE OR SEARCH THIS CLASS, SUBCLASS:

355+, for an instrument there provided for having, as a perfecting feature, an indicator of direction of force traversing natural media.

SEE OR SEARCH CLASS

73, Measuring and Testing,

178+, for navigating instruments in general, and subclasses 170.01+ for indicators of directions of fluid flow.

74, Machine Element or Mechanism, 5.22, as the generic place for gyroscopes combined with other structures.

324, Electricity: Measuring and Testing,

244, for devices for determining magnetic field strength and for devices generic to the determination of, or the determination of both, magnetic field strength and direction.

434, Education and Demonstration

111, 186, and 239+ for devices for instructing or training in the use of direction indicators, including devices for simulating compasses and for simulating their performance under conditions encountered in actual use.