Transducers coated with anechoic material for use in down...

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

Reexamination Certificate

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C367S081000, C367S083000

Reexamination Certificate

active

07061830

ABSTRACT:
A communication device is located within a well and includes a transducer that converts a first electrical signal into a first acoustic signal for transmission through the well and that converts second acoustic signal received from the well to a second electrical signal. The transducer is at least partially coated with an anechoic material in order to reduce the effects of acoustic signal impairments, such as echoes, flow and machine noise, and reverberations. The anechoic material has a thickness that is a fraction of a wavelength of the acoustic signals.

REFERENCES:
patent: 4860851 (1989-08-01), Krevor et al.
patent: 4883143 (1989-11-01), Lagier
patent: 5485053 (1996-01-01), Baz
patent: 6176312 (2001-01-01), Tubel et al.
patent: WO 91/03808 (1991-03-01), None
patent: WO 91/03808 (1991-03-01), None
The American Heritage Dictionary of the English Language, 2000, Fourth Edition.
WordNet 1.6, 1997 Princeton University.

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