3m Innovative Properties Company

Himanshu Jasuja

Michael S Wendland

Andrew R Fox

Michael W Kobe

Bryan L Gerhardt

Michael R Berrigan

Jonathan M Lise

Nathan E Schultz

Daniel C Duan

Zhiqun Zhang

Glen O Gregerson

Seth M Kirk

Tien T Wu

Liang Cheng

Gerry A Hoffdahl

Mikhail A Belkin

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.

Pleated filtration assembly comprising spunbonded prefilter

An air filter media () including a pleated fibrous filtration web () with a first major side () that includes at least one sorbent-loaded area () in which sorbent particles () are present on a first major surface () of the pleated fibrous filtration web (), at least some of the sorbent particles () being post-pleat-deposited sorbent particles.

Air filter media with post-pleat-deposited sorbent particles

A sorbent suitable for sorbing aldehydes includes acidified zeolite impregnated with a urea-based compound, the acidified zeolite having a pore opening of 5 &#x212b; or greater and a molar ratio of silicate to aluminate of at least 1.1:1. The sorbent may be prepared by impregnating acidified zeolite with a solution of a urea-based compound, where the acidified zeolite includes proton counterions. The sorbent may be supported on a filter support to provide an air filter.

Urea-impregnated zeolite sorbents and method for making the same

An air filter including a filter support that supports polymeric sorbent particles. The polymeric sorbent particles are the reaction product of a hydrolyzed divinylbenzene/maleic anhydride precursor polymeric material with a nitrogen-containing compound, with the nitrogen-containing compound being ionically attached to the hydrolyzed divinylbenzene/maleic anhydride.

Air filters comprising polymeric sorbents for aldehydes

An air filter () comprises an air filter media () with a sorbent-free area () that provides a visual filter life indicator zone () and with a sorbent-loaded area () that provides a visual reference zone ().

Air filter with visual filter life indicator zone and sorbent-loaded visual reference zone

An air filter including a filter support that supports polymeric sorbent particles. The polymeric sorbent is the reaction product of a divinylbenzene/maleic anhydride precursor polymeric material with a nitrogen-containing compound.

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Saint Paul, MN, United States of America

Himanshu Jasuja