US PATENT SUBCLASS 33 / 544
.~.~ Earth cavity or tube

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

501  DF  GAUGE {61}
542  DF  .~ Internal {6}
544.~.~ Earth cavity or tube {2}
544.1  DF  .~.~.~> Including means to rotate probe
544.2  DF  .~.~.~> Having means to actuate probe {1}

DEFINITION

Classification: 33/544

Earth cavity or tube:

(under subclass 542) Subject matter wherein the passageway or cavity is a pipe, casing, or hole in the earth.

SEE OR SEARCH THIS CLASS, SUBCLASS:

178, for internal or external size of circular objects including bore hole size.

304+, for a borehole direction or inclination indication of force traversing natural media.

SEE OR SEARCH CLASS

73, Measuring and Testing,

152.01, for a borehole and drilling study.

250, Radiant Energy, 256+, for well testing apparatus and methods.

324, Electricity: Measuring and Testing,

323+, for subsurface testing including a borehole and subclass 220 for magnetic sensor testing within a pipe or borehole.

356, Optics: Measuring and Testing,

241.1+, for bore inspection.

367, Communication, Electrical: Acoustic Wave Systems and Devices,

81+, for wellbore telemetering.

600, Surgery,

101+, for an endoscope.