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. 23, 2024
Filed:
Oct. 06, 2021
Hotaru Hashikawa, Kanagawa, JP;
Tatsuya Kubo, Kanagawa, JP;
Kazuki Yogosawa, Tokyo, JP;
Yuta Yabuta, Kanagawa, JP;
Takuya Suganuma, Kanagawa, JP;
Hotaru Hashikawa, Kanagawa, JP;
Tatsuya Kubo, Kanagawa, JP;
Kazuki Yogosawa, Tokyo, JP;
Yuta Yabuta, Kanagawa, JP;
Takuya Suganuma, 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. The filter includes 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 lower weight density per unit volume at the first side than at the second side. At least a side face of the first side of the filter is covered with an air-impermeable member. The side face is a lateral face of the filter at the first side.