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:
Oct. 30, 2018
Filed:
Oct. 02, 2014
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Cataler Corporation, Kakegawa-shi, Shizuoka-ken, JP;
Akira Morikawa, Nagakute, JP;
Kae Konishi, Nagakute, JP;
Toshitaka Tanabe, Nagakute, JP;
Akihiko Suda, Nagakute, JP;
Masahide Miura, Toyota, JP;
Isao Chinzei, Toyota, JP;
Hiromasa Suzuki, Toyota, JP;
Akiya Chiba, Shizuoka, JP;
Kosuke Iizuka, Kakegawa, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Aichi-ken, JP;
CATALER CORPORATION, Kakegawa-shi, Shizuoka-ken, JP;
Abstract
A ceria-zirconia composite oxide includes at least one of lanthanum, yttrium, and praseodymium. A rate of a total content of the at least one rare earth element to a total content of cerium and zirconium is 0.1 at % to 4.0 at %. A content of the rare earth element present in near-surface regions, which are at a distance of less than 50 nm from surfaces of primary particles of the ceria-zirconia composite oxide, accounts for 90 at % or more of the total content of the rare earth element. An average particle size of the primary particles of the ceria-zirconia composite oxide is 2.2 μm to 4.5 μm. After a predetermined durability test, the intensity ratio I(14/29) of a diffraction line at 2θ=14.5° to a diffraction line at 2θ=29° and the intensity ratio I(28/29) of a diffraction line at 2θ=28.5° to the diffraction line at 2θ=29° respectively satisfy the following conditions:(14/29)≥0.02, and(28/29)≤0.08.