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. 14, 2024
Filed:
Jan. 20, 2021
Applicant:
3m Innovative Properties Company, St. Paul, MN (US);
Inventors:
Fuming B. Li, Woodbury, MN (US);
John M. Brandner, St. Paul, MN (US);
Nathan E. Schultz, Woodbury, MN (US);
John M. Sebastian, Oakdale, MN (US);
Assignee:
3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D04H 1/435 (2012.01); B01D 39/16 (2006.01); D01F 1/10 (2006.01); D04H 1/4382 (2012.01); D04H 3/011 (2012.01); D04H 3/14 (2012.01);
U.S. Cl.
CPC ...
D04H 1/435 (2013.01); B01D 39/16 (2013.01); B01D 39/1692 (2013.01); D01F 1/10 (2013.01); D04H 1/4382 (2013.01); D04H 3/011 (2013.01); D04H 3/14 (2013.01); B01D 2239/0435 (2013.01);
Abstract
Charged polymeric webs, such as electret webs, include a thermoplastic resin and a charge-enhancing additive. The additives are substituted heterocyclic thiols. The heterocyclic thiol has 2 nitrogen groups and a third group that may be an NH, N—NH, O, or S group. The substituent group is an aromatic or heterocyclic aromatic group. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.