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:
Dec. 24, 2019
Filed:
Nov. 14, 2016
Applicant:
Toray Industries, Inc., Tokyo, JP;
Inventors:
Assignee:
Toray Industries, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 53/02 (2006.01); B01D 39/14 (2006.01); D06M 10/00 (2006.01); D04H 1/4291 (2012.01); D04H 1/435 (2012.01); D04H 1/56 (2006.01); G01R 23/17 (2006.01);
U.S. Cl.
CPC ...
B01D 39/14 (2013.01); D04H 1/4291 (2013.01); D04H 1/435 (2013.01); D04H 1/56 (2013.01); D06M 10/00 (2013.01); B01D 2239/0435 (2013.01); B01D 2239/0618 (2013.01); B01D 2239/0622 (2013.01); G01R 23/17 (2013.01);
Abstract
A fiber sheet is densely charged with electric charge and provides an electret fiber sheet that has excellent dust collecting performance. The electret fiber sheet is an electret fiber sheet in which averages of a* values and b* values satisfy all requirements of the following (a) to (c): (a) 10≤average of (a* values)≤40; (b) −25≤average of (b* values)≤0; and (c) −5≤average of [(a* values)+(b* values)]≤40; wherein a* and b* are values measured by a spectrophotometer when a red positive charge toner and a blue negative charge toner are attached.