1
James V Leggett III: Measurement-while-drilling acoustic system employing multiple, segmented transmitters and receivers. Baker Hughes Incorporated, Madan Mossman & Sriram P C, July 4, 2000: US06084826 (208 worldwide citation)

This invention is directed toward apparatus and methods for obtaining acoustic measurements or "logs" of earth formations penetrated by a borehole. More particularly, the invention is directed toward obtaining the acoustic measurements while the borehole is being drilled. The downhole apparatus comp ...


2
James V Leggett III, Vladimir Dubinsky, Douglas Patterson: Measurement-while-drilling acoustic system employing multiple, segmented transmitters and receivers. Baker Hughes Incorporated, Madan Mossman & Sriram P C, September 2, 2003: US06614360 (54 worldwide citation)

An acoustic MWD system comprises at least one transmitter array and at least one receiver array spaced axially along an essentially tubular downhole subassembly. Each transmitter and receiver array includes a plurality of elements circumferentially disposed on the outside of the assembly. The downho ...


3
Leggett James V Iii: A measurement-while-drilling acoustic system employing multiple, segmented transmitters and receivers. Baker Hughes, October 8, 1997: GB2311859-A

This invention is directed toward apparatus and methods for obtaining acoustic measurements or "logs" of earth formations penetrated by a borehole. More particularly, the invention is directed toward obtaining the acoustic measurements while the borehole is being drilled. The downhole apparatus comp ...


4
Leggett James V Iii: Systeme de diagraphie acoustique pendant le forage utilisant des emetteurs segmentes multiples et des recepteurs, A measurement-while-drilling acoustic system employing multiple, segmented transmitters and receivers. Baker Hughes Incorporated, Baker Hughes Incorporated, GOWLING LAFLEUR HENDERSON, July 18, 1996: CA2209947

This invention is directed toward apparatus and methods for obtaining acoustic measurements or "logs" of earth formations penetrated by a borehole. More particularly, the invention is directed toward obtaining the acoustic measurements while the borehole is being drilled. The downhole apparatus comp ...


5
Leggett James V Iii: A measurement-while-drilling acoustic system employing multiple, segmented transmitters and receivers. Baker Hughes Incorporated, ROWOLD Carl A, July 18, 1996: WO/1996/021871

This invention is directed toward apparatus and methods for obtaining acoustic measurements or 'logs' of earth formations penetrated by a borehole. More particularly, the invention is directed toward obtaining the acoustic measurements while the borehole is being drilled. The downhole apparatus comp ...