US 12,233,358 B2
Filter device
Nobuyuki Kitajima, Kanagawa (JP); and Nobuki Sasaki, Kanagawa (JP)
Assigned to YAMASHIN-FILTER CORP., Kanagawa (JP)
Filed by YAMASHIN-FILTER CORP., Kanagawa (JP)
Filed on Apr. 25, 2022, as Appl. No. 17/727,948.
Application 17/727,948 is a continuation of application No. PCT/JP2020/041192, filed on Nov. 4, 2020.
Claims priority of application No. 2019-203530 (JP), filed on Nov. 8, 2019.
Prior Publication US 2022/0241703 A1, Aug. 4, 2022
Int. Cl. B01D 29/15 (2006.01)
CPC B01D 29/15 (2013.01) [B01D 2201/291 (2013.01); B01D 2201/52 (2013.01); B01D 2201/56 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A filter device comprising:
a filter case having a tubular shape and comprising an opening at an upper end or a lower end of the filter case, with an other end being covered;
a head made of metal and provided in the filter case to cover the opening;
a filtration member having a tubular shape and provided in an internal space formed by the filter case and the head;
a plate made of metal and provided near the opening of the filter case;
an IC tag provided between the filtration member and the plate; and
an antenna unit provided in the head and provided with an antenna section comprising an antenna configured to communicate with the IC tag, wherein
the antenna unit comprises a case having a rod shape and inserted into the head,
the antenna section is provided at a first end corresponding to one end of the case,
the case is provided in the head such that the antenna section is exposed when the head is viewed from a side of the filter case,
the plate is provided with an aperture from which the IC tag is exposed,
the IC tag has a hollow disk shape,
the plate is provided with a plurality of the apertures, and
centers of the plurality of apertures are evenly arranged along a circle centered at a center axis of the filter case and having a diameter larger than an inner diameter of the IC tag and smaller than an outer diameter of the IC tag.