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:
Jul. 29, 2025
Filed:
Dec. 14, 2022
Kaede Masuko, Shizuoka, JP;
Tohru Suganuma, Shizuoka, JP;
Minoru Masuda, Shizuoka, JP;
Masashi Nagayama, Shizuoka, JP;
Hiroyuki Kishida, Shizuoka, JP;
Tomomi Suzuki, Shizuoka, JP;
Kento Takeuchi, Shizuoka, JP;
Kaede Masuko, Shizuoka, JP;
Tohru Suganuma, Shizuoka, JP;
Minoru Masuda, Shizuoka, JP;
Masashi Nagayama, Shizuoka, JP;
Hiroyuki Kishida, Shizuoka, JP;
Tomomi Suzuki, Shizuoka, JP;
Kento Takeuchi, Shizuoka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A carrier is provided that includes a core particle and a coating layer coating the core particle. The coating layer includes a resin and chargeable inorganic fine particles, and has voids. The resin has an average film thickness of 0.10 μm or larger and smaller than 0.45 μm. The coating layer has a porosity of 0.1% or higher and lower than 2.8%, when the porosity expressed by the following equation:Porosity [%]=1/2×100where, on a cross section of the coating layer, S1 represents a cross sectional area of the voids and S2 represents a cross sectional area of the resin.