BOPI 03 BR/2023 REPERTOIRE NUMERIQUE 20 (11) 20843 (51) F16L 15/04 (2018.01) (21) 1202100417 - PCT/JP2020/009003 (22) 03/03/2020 (30) JP n° 2019-060590 du 27/03/2019 (54) Threaded Coupling For Steel Pipe. (72) IWAMOTO, Michihiko (JP); KOCHI, Yasuhiro (JP) et TOYOTA, Yusuke (JP) (73) Nippon Steel Corporation, 6-1, Marunouchi 2-chome, Chiyoda-ku, TOKYO 100-8071 (JP) (74) SPOOR & FISHER Inc. NGWAFOR & PARTNERS Sarl, The House of Gideon, Golf/Bastos Quarters, Opposite The American Embassy, Entrance-Saint John Paul II Boulevard, P.O. Box 8211, YAOUNDE (CM). (57) Provided is a threaded coupling for a steel pipe, which can be quickly and properly fastened. This threaded coupling comprises a steel pipe 20m, a steel pipe 20f, and a coupling 50 for fastening the steel pipes 20m and 20f to each other. The respective pipe main bodies 21m and 21f of the steel pipes 20m and 20f include an annular marking groove 23m and 23f formed on the outer circumference of the pipe main body 21 m and 21f. Fig. 1 Consulter le mémoire ________________________________________ (11) 20844 (51) E21B 47/14 (2018.01); E21B 47/18 (2018.01); G01V 11/00 (2018.01); G10K 9/13 (2018.01); H04B 11/00 (2018.01) (21) 1202100436 - PCT/IB2020/052527 (22) 19/03/2020 (30) IT n° 102019000004215 du 22/03/2019 (54) Electro-acoustic transducer.
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