3M Innovative Properties Company

Bryan L Gerhardt

Andrew R Fox

Glen O Gregerson

Michael R Berrigan

Zhiqun Zhang

Stephen M Sanocki

Judd D Olson

Jacob T Lusson

Dawud H Tan

Saurabh Batra

Brett P Krull

Himanshu Jasuja

Mark A Sanocki

Craig D Thompson

William J Kopecky

Jonathan M Lise

Nathan E Schultz

John D Stelter

Daniel C Duan

Seth M Kirk

Tien T Wu

Philip D Eitzman

Ignatius A Kadoma

Jimmy Minh Le

Patrick J Sager

Liming Song

Daniel E Johnson

Gerry A Hoffdahl

Edward Keith Willis

Mikhail A Belkin

Samantha D Smith

Zackary J Becker

Nhat Ha Thi Nguyen

Jacob J Thelen

Changwen Li

Alexander P Flage

Kent B Willgohs

Filter frame

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

Reusable filter frame for filter media

A conformable, unframed pleated air filter, comprising a plurality of bridging filaments on at least one face of the pleated air filter.

Conformable pleated air filter with bridging filaments

The present disclosure relates to multi-layer composite articles including at least two nonwoven web layers. Each or the layers may be a spunbonded web, and each may include biodegradable materials. The multi-layered composites of the present disclosure are particularly well suited for air filtration, as they can combine a high dust holding capacity with sufficient strength, dimensional stability, and a relatively low pressure drop.

Multi-layer, biodegradable composites for air filtration

A pleated air filter media is provided. The pleated air filter media comprises a plurality of upstream linear bridging filaments that are extrusion-bonded to at least some of a plurality of upstream pleat tips of a fibrous web, and a plurality of downstream continuous-contact filaments that are extrusion-bonded to a downstream face of the fibrous web. Methods of making and using the same are also provided.

Pleated air filter with bridging filaments and continuous-contact filaments

The present disclosure provides adhesive articles that can be removed from surfaces without damage by having reduced or eliminated contribution of a core backing to peel force generated by the adhesive during removal. In some instances, this can be accomplished by a core that loses structural integrity in a direction normal to a plane defined by a major surface. In other instances, the contribution is reduced by compromising the interface between the core and a peelable adhesive layer.

Adhesive articles permitting damage free removal

A relofted, spunbonded nonwoven web exhibiting a solidity of from less than 8.0%, to at least 3.0%, and exhibiting a Quality Factor of at least 0.30. Methods of making a relofted web; and, methods of using a relofted web as an air-filtration web, e.g. as a filter media or a layer thereof.

Air-filter media comprising a relofted spunbonded web, and methods of making and using

The present disclosure relates to air filters. More particularly, it relates to air filters including pleated filter media that can be uniformly expanded and contracted. In some embodiments, the air filters are adjustably sized air filter systems. In some embodiments, the air filters can be used in a window opening.

Uniformly expandable air filter

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

Growing community of inventors

Woodbury, MN, United States of America

Bryan L Gerhardt