Down hole pressure/temperature gage connect/disconnect method an

Downhole seismic source

Drill string telemeter system

Dual electroacoustic transducers

Dual function logging tool and method

Dual mode transmitter-receiver and decoder for RF...

Dual mode transmitter-receiver and decoder for RF...

Dual mode transmitter-receiver and decoder for RF...

Dual mode transmitter-receiver and decoder for RF...

Dual mode transmitter/receiver and decoder for RF transponder ta

Dual mode transmitter/receiver and decoder for RF...

Dual track surface acoustic wave RFID/sensor

Duplex transmission in an electromagnetic transponder system

Dynamic configuration of a radio frequency transponder

Efficient protocol for reading RFID tags

Electroacoustic transducer for deep submersion

Electromagnetic lithosphere telemetry system

Electromagnetic transponder read terminal operating in very...

Electromagnetic transponder with no autonomous power supply

Electromagnetic wave telemetry system for transmitting downhole