US PATENT SUBCLASS 250 / 257
.~.~ With casing collar detection


Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

253  DF  GEOLOGICAL TESTING OR IRRADIATION {3}
256  DF  .~ Well testing apparatus and methods {9}
257.~.~ With casing collar detection


DEFINITION

Classification: 250/257

(under subclass 256) Subject matter which additionally includes apparatus which includes a detector to sense the location of a pipe collar in a cased well and methods corresponding to the apparatus.

(1) Note. The collar detector need not be a radiation detector but can be any type which senses the position of the pipe collar in a well.

SEE OR SEARCH CLASS

73, Measuring and Testing,

152.57, for a determination of a characteristic of a borehole casing wherein the determination is made by making a measurement which is not purely electrical or purely magnetic.