Patent ID: 11880160
Assignee: RICOH COMPANY, LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC G  B | IPC B  G

Claim 11:
12. A filter holding device, comprising:
an opening portion to communicate an inside of the filter holding device with an outside of the filter holding device; and
a filter disposed in the opening portion, the filter including:
a first side facing the inside of the filter holding device; and
a second side facing the outside of the filter holding device,

wherein the filter has a lower weight density per unit volume at the first side than at the second side,
wherein at least a side face of the first side of the filter is covered with an air-impermeable member,
wherein the side face is a lateral face of the filter at the first side,
wherein the air-impermeable member is a member having been cured after application to the filter in a fluid state, and
wherein the air-impermeable member includes an ultraviolet curable resin.