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:
Jan. 27, 2026
Filed:
Sep. 22, 2021
Yuta Yabuta, Kanagawa, JP;
Kazuki Yogosawa, Tokyo, JP;
Tatsuya Kubo, Kanagawa, JP;
Takuya Suganuma, Kanagawa, JP;
Hotaru Hashikawa, Kanagawa, JP;
Yoshihiro Fujiwara, Kanagawa, JP;
Yuta Yabuta, Kanagawa, JP;
Kazuki Yogosawa, Tokyo, JP;
Tatsuya Kubo, Kanagawa, JP;
Takuya Suganuma, Kanagawa, JP;
Hotaru Hashikawa, Kanagawa, JP;
Yoshihiro Fujiwara, Kanagawa, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
A filter holding device includes an opening portion and a filter. The opening portion communicates an inside of the filter holding device with an outside of the filter holding device, and has a rim that extends in a communication direction from the inside of the filter holding device toward the outside of the filter holding device. The filter is disposed in the opening portion, and has a first side and a second side. The first side faces the inside of the filter holding device. The second side faces the outside of the filter holding device. The filter has a larger weight density per unit volume at the second side facing the outside of the filter holding device than at the first side facing the inside of the filter holding device in a state in which the filter is disposed in the opening portion.