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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 12467572 B1

PDFFull Text
Date of Patent:
Nov. 11, 2025

Filed:

Aug. 22, 2023

Pipe joint and manufacturing method of pipe joint

Applicant:

Daikin Industries, Ltd., Osaka, JP;

Inventors:

Hayato Tsuda, Osaka, JP;

Tadaharu Isaka, Osaka, JP;

Yumi Zenke, Osaka, JP;

Yukari Yamamoto, Osaka, JP;

Yasuyuki Yamaguchi, Osaka, JP;

Hiroyuki Hamada, Osaka, JP;

Assignee:

DAIKIN INDUSTRIES, LTD., Osaka, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Alison L Hindenlang

Assistant Examiner:

Debjani undefined Roy

Int. Cl.
CPC ...
B29C 45/26 (2006.01); B29C 45/14 (2006.01); B29C 45/72 (2006.01); B29D 23/00 (2006.01); C08F 214/26 (2006.01); F16L 41/02 (2006.01); B29C 45/17 (2006.01); B29C 45/36 (2006.01); B29K 27/18 (2006.01); B29K 105/00 (2006.01); B29L 23/00 (2006.01);
U.S. Cl.
CPC ...
F16L 41/021 (2013.01); B29C 45/14065 (2013.01); B29C 45/261 (2013.01); B29C 45/7207 (2013.01); B29D 23/001 (2013.01); C08F 214/262 (2013.01); B29C 2045/1719 (2013.01); B29C 2045/363 (2013.01); B29K 2027/18 (2013.01); B29K 2105/0085 (2013.01); B29K 2995/0077 (2013.01); B29K 2995/0097 (2013.01); B29L 2023/22 (2013.01); C08F 2800/20 (2013.01);
Abstract

Provided is a pipe joint including a cylindrical hollow, wherein the wall thickness of a part having the largest wall thickness of the pipe joint is 2 to 7 mm, the ratio of the length of the hollow in the axial direction (L) to the diameter of the hollow (D), (L/D), is 5 or less, the pipe joint contains a copolymer containing tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit, the content of the fluoro(alkyl vinyl ether) unit of the copolymer is 2.8 to 6.0% by mass with respect to the whole of the monomer units, the melt flow rate at 372° C. of the copolymer is 4.0 g/10 min or higher and lower than 11.0 g/10 min, and the number of functional groups of the copolymer is 50 or less.

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