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:
Dec. 02, 2025
Filed:
Apr. 29, 2022
Fujifilm Business Innovation Corp., Tokyo, JP;
Tsutomu Furuta, Kanagawa, JP;
Daisuke Ishizuka, Kanagawa, JP;
Erina Saito, Kanagawa, JP;
Tomohito Nakajima, Kanagawa, JP;
FUJIFILM Business Innovation Corp., Tokyo, JP;
Abstract
An electrostatic charge image developing toner contains toner particles that contain a binder resin and resin particles and an external additive that contains inorganic particles, in which a loss coefficient tan δof the resin particles at 40° C. and 0.1 rad/s satisfies 0.1<tan δ<1.0, a loss coefficient tan δof the resin particles at 40° C. and 10 rad/s satisfies 1.3<tan δ<3.0, and in a case where a strain of 0.005% is applied to the toner at 40° C., a stress relaxation time τ of the toner satisfies 5 seconds<τ<500 seconds.