Number | Date | Country | Kind |
---|---|---|---|
6-086941 | Apr 1991 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
3633403 | McDonald | Jan 1972 | |
3697940 | Berka | Oct 1972 | |
3961308 | Parker | Jun 1976 | |
4283780 | Nardi | Aug 1981 | |
4293936 | Cox et al. | Oct 1981 | |
4646999 | Lygas | Jan 1987 | |
5022014 | Kulczyk et al. | Jun 1991 |
Number | Date | Country |
---|---|---|
0552833 | Jul 1993 | EPX |
56-125595 | Oct 1981 | JPX |
62-2113 | Jan 1987 | JPX |
Entry |
---|
Grudzinski et al, "Telemetry Using the Propagation of an Electromagnetic Wave Along a Drill Pipe String", Louisiana State University, Baton Rouge, LA, Feb. 26-27, 1990, pp. 66-74. |
A. Jitsumori et al., "Measured Data Transmission Technique at Underground in Oil Excavation", IEEE Journal Japan, vol. 112, No. 11, 1992, pp. 877-884. |
A. Kawabata, "Ultrasonic Transducer", Measurement and Control, vol. 28, No. 5, May 1989, pp. 398-403. |