US PATENT SUBCLASS 340 / 854.2
.~.~ Location of collar or stuck tool

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

853.1  DF  WELLBORE TELEMETERING OR CONTROL (E.G., SUBSURFACE TOOL GUIDANCE, DATA TRANSFER, ETC.) {14}
854.1  DF  .~ With position or depth recording (e.g., line payout, equipment locator, etc.) {1}
854.2.~.~ Location of collar or stuck tool

DEFINITION

Classification: 340/854.2

Location of collar or stuck tool:

(under subclass 854.1) Subject matter including equipment to ascertain the identity of a collar or the presence of a stuck tool.

SEE OR SEARCH CLASS

33, Geometrical Instruments,

302, and 304+ for wellbore configuration determination.

73, Measuring and Testing,

152.56, for a process or an apparatus for determining a free point or a stuck point of a casing in a borehole, per se, not involving a purely electronic test or a purely electrical test.

235, Registers,

375+, for a system controlled by a data bearing coded record; and subclass 435, for a coded record sensor.