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:
Aug. 05, 2025
Filed:
Jan. 22, 2021
Unitika Ltd., Osaka, KR;
Maiko Sakai, Kyoto, KR;
Norihiro Naito, Kyoto, KR;
UNITIKA LTD., Osaka, KR;
Abstract
An object of the present invention is to provide a water purification filter comprising activated carbon as a filtration material and a biodegradable polymer as a binder component, which water purification filter has a filtration flow rate sufficient for practical use as a pot-type water purifier while maintaining a certain free residual chlorine filtration capacity, and has a certain degree of hardness and excellent handleability. Provided is a water purification filter obtained by winding a nonwoven sheet containing fibrous activated carbon and a heat fusible core-sheath composite fiber and then heat fusing the sheet, wherein the heat fusible core-sheath composite fiber includes a sheath portion containing a biodegradable polyester resin having a melting point of 80 to 140° C. and a core portion containing a synthetic resin having a melting point at least 20° C. higher than the melting point of the biodegradable polyester resin, and wherein the water purification filter has a density of 0.12 to 0.30 g/cmand a specific surface area of 500 to 1800 m/g.