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.:
Date of Patent:
Aug. 11, 2026
Filed:
Apr. 27, 2022
Ntn Corporation, Osaka, JP;
Keeper Co., Ltd., Kanagawa, JP;
Mika Kohara, Shizuoka, JP;
Sho Takeshita, Shizuoka, JP;
Hiroshi Murakami, Shizuoka, JP;
Shuichi Sato, Kanagawa, JP;
Rina Ozawa, Kanagawa, JP;
Kouji Masujima, Kanagawa, JP;
NTN CORPORATION, Osaka, JP;
KEEPER CO., LTD., Kanagawa, JP;
Abstract
A flexible boot for a constant velocity universal joint includes: attachment portions to a mating member at both ends; and a bent portion provided between the attachment portions and absorbing deformation caused by operation of a constant velocity universal joint. The flexible boot is made of a rubber material obtained by blending 50 to 80 parts by weight of HNBR having an acrylonitrile content of 15 to 21 wt % and 20 to 50 parts by weight of EPDM, the rubber material having an elastic recovery rate of 18% or more at −40° C. in a TR test.