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:
May. 30, 2023
Filed:
Apr. 15, 2020
Applicant:
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Inventors:
Takeshi Kaneko, Tainai, JP;
Hirotoshi Sato, Tokyo, JP;
Toshihiko Suwa, Tainai, JP;
Makoto Yokoyama, Tainai, JP;
Haruhiko Adachi, Tainai, JP;
Takeshi Matsumura, Tainai, JP;
Assignee:
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N 15/08 (2006.01); F24F 7/00 (2021.01); F24F 13/28 (2006.01);
U.S. Cl.
CPC ...
G01N 15/082 (2013.01); G01N 15/0806 (2013.01); G01N 2015/084 (2013.01);
Abstract
Provided is a fan filter unit with which the performance of a HEPA filter can be measured at multiple points with ease and in a short time. The fan filter unit has a first HEPA filter, a second HEPA filter, and exhaust means installed between the first HEPA filter and the second HEPA filter. The first HEPA filter, the second HEPA filter, and the exhaust means are integrated by a housing.