Threaded joint for pipes

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 11905765
APP PUB NO 20230044251A1
SERIAL NO

17757722

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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To prevent fracture of a box under a tensile load without increasing the outer diameter of the box. The presently disclosed threaded joint for pipes includes a pin provided with a male thread portion at one end of a first pipe, and a box provided with a female thread portion at one end of a second pipe, where each of a plurality of thread grooves of the female thread portion has a corner portion on a load flank side and a corner portion on a stabbing flank side on a thread bottom side, a corner portion on a load flank side of a first thread groove includes a first arc portion that has a first curvature radius, and a second arc portion that has a second curvature radius, and a ratio of the second curvature radius to the first curvature radius is 3 or more.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
JFE STEEL CORPORATION2-3 UCHISAIWAICHO 2-CHOME CHIYODA-KU TOKYO 100-0011

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Goto, Seigo Tokyo, JP 10 2
Kawai, Takamasa Tokyo, JP 25 51
Nagahama, Takuya Tokyo, JP 19 70
Takano, Jun Tokyo, JP 54 282
Yoneyama, Tsuyoshi Tokyo, JP 42 136
Yoshikawa, Masaki Tokyo, JP 51 262

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