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:
Oct. 27, 2026
Filed:
Sep. 24, 2021
Kao Corporation, Tokyo, JP;
Tomoyuki Motegi, Ichikai-machi, JP;
Yuta Abe, Utsunomiya, JP;
Ryota Shiiba, Utsunomiya, JP;
Takehiko Uematsu, Oyama, JP;
Hideo Kobayashi, Tokyo, JP;
Yoshihiko Kondo, Utsunomiya, JP;
KAO CORPORATION, Tokyo, JP;
Abstract
A sheet () for a mask has a first fiber layer () and a second fiber layer (). The second fiber layer () has a higher trapping ratio for particles having a particle diameter exceeding 1 μm and/or a smaller average fiber diameter than the first fiber layer (). The basis weight of the second fiber layer () is from 1 to 20 g/m. In a natural state, the second fiber layer () has a plurality of projections () projecting toward a surface of the second fiber layer () that is opposite to a surface of the second fiber layer () facing the first fiber layer () and depressions () that are each arranged between corresponding projections () of the plurality of projections (). The depressions () have joined portions () where the second fiber layer () and the first fiber layer () are joined to each other.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile