Active noise cancellation through the use of magnetic coupling

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging

Reexamination Certificate

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C181S105000

Reexamination Certificate

active

07911877

ABSTRACT:
Passive suppression of casing signals is used to improve the ability to measure formation velocities. Passive suppression includes the use of a magnet slidably coupled to the casing.

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