BOPI 08 BR/2023 REPERTOIRE NUMERIQUE 19 (54) Screw-threaded joint (72) SUGINO, Masaaki (JP); OKU, Yousuke (JP); MARUTA, Satoshi (JP) et FOTHERGILL, Alan (FR) (73) 1-Nippon Steel Corporation, 6-1, Marunouchi 2-chome, Chiyoda-ku, TOKYO 1008071 (JP) et 2-Vallourec Oil and Gas France, 54 rue Anatole France, AULNOYE-AYMERIES 59620 (FR) (74) SPOOR & FISHER Inc. NGWAFOR & PARTNERS SARL, The House of Gideon, Golf/Bastos Quarter, Opposite The American Embassy, Entrance-Saint John Paul II Boulevard, B.P. 8211, YAOUNDE (CM). (57) In a threaded connection of a two-step thread construction including intennediate shoulder surfaces, a break is prevented near the intennediate critical cross sections upon application of a tensile load and the intermediate shoulder surfaces are easier to create, thus improving productivity. The outer periphery portion of the pin 2 located between the intennediate shoulder surface 24 of the pin 2 and the second male thread 27 is provided with a circumferential groove 25 including a curved surface 25a smoothly contiguous to the intennediate shoulder surface 24, thereby mitigating plastic strains generated near the pin intermediate critical cross section PICCS. The inner periphery portion of the box 3 located between the intennediate shoulder surface 35 of the box 3 and the first female thread 32 is provided with a circumferential groove 34 including a curved surface 34a smoothly contiguous to the intennediate shoulder surface 35, thereby mitigating plastic strains generated near the box intennediate critical cross section BICCS. Consulter le mémoire ________________________________________ (11) 21092 (51) C04B 2/06 (2018.01); C04B 7/06 (2018.01); C04B 7/36 (2018.01); C04B 7/42 (2018.01) ; C04B 7/43 (2018.01) (21) 1202200058 - PCT/US2020/046063 (22) 13/08/2020 (30) US n° 62/886,137 du 13/08/2019; US n° 62/913,620 du 10/10/2019; US n° 62/932,200 du 07/11/2019; US n° 63/019,916 du 04/05/2020 (54) Process to make calcium oxide or ordinary portland cement from calcium bearing rocks and minerals. (72) LEANDRI, Hugo F. (US) et FINKE, Cody E. (US) (73) 1-CALIFORNIA INSTITUTE OF TECHNOLOGY, 1200 E. California Blvd., M/C 6-32, PASADENA, California 91125 (US) et
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