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.

Date of Patent:
Jan. 20, 2026

Filed:

Sep. 22, 2022
Applicant:

Fujifilm Business Innovation Corp., Tokyo, JP;

Inventors:

Ryo Nagai, Kanagawa, JP;

Sakon Takahashi, Kanagawa, JP;

Yasuaki Hashimoto, Kanagawa, JP;

Moegi Iguchi, Kanagawa, JP;

Yosuke Tsurumi, Kanagawa, JP;

Ryo Otake, Kanagawa, JP;

Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G 9/097 (2006.01); G03G 9/08 (2006.01);
U.S. Cl.
CPC ...
G03G 9/09708 (2013.01); G03G 9/0819 (2013.01); G03G 9/0827 (2013.01); G03G 9/09725 (2013.01);
Abstract

An electrostatic charge image developing toner contains toner particles, silica particles that are added to an exterior of the toner particles, and titanic acid compound particles that are added to the exterior of the toner particles and have an average circularity of 0.890 or more and 0.950 or less, in which the silica particles include particles having a primary particle size of 80 nm or less, the particles having a primary particle size of 80 nm or less have at least one peak in a range of 20 nm or more and less than 80 nm in a number-based primary particle size distribution curve (hereinafter, silica particles having such a peak will be called 'specific silica particles'), the titanic acid compound particles have at least one peak in a range of 20 nm or more and less than 80 nm in a number-based primary particle size distribution curve, a difference between an average circularity of the specific silica particles and the average circularity of the titanic acid compound particles is 0.05 or less, and a difference between a toner coverage of the specific silica particles and a toner coverage of the titanic acid compound particles is 20% points or less.


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