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. 16, 2025
Filed:
Jun. 11, 2024
Yumi Inoue, Kanagawa, JP;
Osamu Saito, Kanagawa, JP;
Minoru Toyoda, Kanagawa, JP;
Tatsuya Ohhira, Kanagawa, JP;
Yuuji Ishikura, Kanagawa, JP;
Toshiki Hayashi, Kanagawa, JP;
Yumi Inoue, Kanagawa, JP;
Osamu Saito, Kanagawa, JP;
Minoru Toyoda, Kanagawa, JP;
Tatsuya Ohhira, Kanagawa, JP;
Yuuji Ishikura, Kanagawa, JP;
Toshiki Hayashi, Kanagawa, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
A developing device includes a developer bearer, a first conveying screw conveying developer from one end to another end of a first conveyance path in a first direction, a second conveying screw conveying the developer in a direction opposite to the first direction in a second conveyance path, and a partition having a first communication port communicating the one end of the first conveyance path and the second conveyance path. A shaft diameter of the first conveying screw from one end to a position away from the first communication port by a first predetermined distance is smaller than a shaft diameter of another portion of the first conveying screw. A shaft diameter of the second conveying screw from one end to a position away from the first communication port by a second predetermined distance is larger than a shaft diameter of another portion of the second conveying screw.