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:
Sep. 09, 2025
Filed:
Jun. 30, 2021
3m Innovative Properties Company, St. Paul, MN (US);
Himanshu Jasuja, Woodbury, MN (US);
Nathan E. Schultz, Woodbury, MN (US);
Seth M. Kirk, Minneapolis, MN (US);
Bryan L. Gerhardt, Woodbury, MN (US);
Daniel C. Duan, St. Paul, MN (US);
Michael R. Berrigan, Oakdale, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A pleated multilayer air filter assembly including a primary filtration layer and a prefilter layer that are bonded to each other and are co-pleated with each other. The primary filtration layer includes meltblown electret fibers. The prefilter layer includes meltspun, spunbonded electret fibers that comprise a radially outer surface comprising polymethylpentene. The ratio of Effective Fiber Diameter of the fibers of the primary filtration layer to Effective Fiber Diameter of the fibers of the primary filtration layer is at least 1.5.