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. 01, 2025
Filed:
Feb. 29, 2024
Taira Otsuka, Kanagawa, JP;
Hiroshi Hosokawa, Kanagawa, JP;
Kazuki Matsumoto, Kanagawa, JP;
Hiroyuki Sugiyama, Kanagawa, JP;
Taira Otsuka, Kanagawa, JP;
Hiroshi Hosokawa, Kanagawa, JP;
Kazuki Matsumoto, Kanagawa, JP;
Hiroyuki Sugiyama, Kanagawa, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
A developing device includes a plurality of conveyance passages, an opening portion, and a filter. Developer is conveyed in the plurality of conveyance passages in a longitudinal direction of the developing device. The opening portion is disposed in one conveyance passage of the plurality of conveyance passages and communicates with an outside of the developing device. The filter is fitted in the opening portion and has both a collecting ability to collect the developer and a ventilation ability to ventilate the one conveyance passage to the outside of the developing device. The collecting ability of the filter is higher in a high-bulk portion in which bulk of the developer increases in the one conveyance passage than in a low-bulk portion in which the bulk of the developer decreases in the one conveyance passage. The ventilation ability of the filter is lower in the high-bulk portion than in the low-bulk portion.