H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/34, 324/8
H04B 13/02 (2006.01) E21B 17/00 (2006.01) E21B 47/12 (2006.01)
Patent
CA 1191554
ABSTRACT The invention is a downhole toroidal coupled telemetry apparatus including at least one annular core member, a plurality of primary windings (126) and a secondary winding (150) comprising a conductive strap of one and one-half turns around the core member and one-half turn provided by an outer portion of the drill collar (38).
395174
Gowling Lafleur Henderson Llp
Tele-Drill Inc.
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