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:
Jun. 23, 2026
Filed:
Apr. 27, 2023
Canon Kabushiki Kaisha, Tokyo, JP;
Kazuyuki Sato, Kanagawa, JP;
Tomohisa Sano, Shizuoka, JP;
Tohru Hiramatsu, Shizuoka, JP;
Hiroki Kagawa, Shizuoka, JP;
Shohei Shibahara, Shizuoka, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A toner comprises a toner particle and silica fine particles, wherein, fragment ions of a D unit structure are observed in time-of-flight secondary ion mass spectrometry measurement of the silica fine particles, in a titration operation of the silica fine particles using NaOH, the titer is within a specific range, an area of a peak from −25 to −15 ppm inSi-NMR measurement of the silica fine particles is denoted by D, the sum of the areas of peaks from −140 to 100 ppm is denoted by S, and an area of a peak from more than −19 ppm to −17 ppm or less is denoted by D1, the specific surface area of the silica fine particles, D, D1, and S satisfy specific relationships, and a specific amount of a specific polyvalent metal element is present on the surface of the toner particle.