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. 30, 2025
Filed:
Jun. 02, 2022
Shohtaroh Hoshi, Kanagawa, JP;
Kazuki Yogosawa, Tokyo, JP;
Tatsuya Kubo, Kanagawa, JP;
Yuta Yabuta, Kanagawa, JP;
Hotaru Hashikawa, Kanagawa, JP;
Takuya Suganuma, Kanagawa, JP;
Takuya Sekine, Kanagawa, JP;
Tatsumi Yamada, Kanagawa, JP;
Shohtaroh Hoshi, Kanagawa, JP;
Kazuki Yogosawa, Tokyo, JP;
Tatsuya Kubo, Kanagawa, JP;
Yuta Yabuta, Kanagawa, JP;
Hotaru Hashikawa, Kanagawa, JP;
Takuya Suganuma, Kanagawa, JP;
Takuya Sekine, Kanagawa, JP;
Tatsumi Yamada, Kanagawa, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
A filter holding device includes an opening portion and a filter. The opening portion communicates between an inside and an outside of the filter holding device. The filter is disposed in the opening portion and includes a first side and a second side. The first side is located adjacent to the inside of the filter holding device. The second side is located adjacent to the outside of the filter holding device. The filter has a larger weight density per unit volume at the second side than a weight density per unit volume at the first side and has a larger area of a surface intersecting a communication direction at the second side than an area of a surface intersecting the communication direction at the first side.