Gerry A Hoffdahl

20130101805, Apr 25, 2013

Jul 6, 2011

13/808106

Gordon L. Altshuler - Sunfish Lake MN, US
James P. Endle - New Richmond WI, US
David L. Vall - Woodbury MN, US
Gerry A. Hoffdahl - Scandia MN, US
Randy L. Robertson - North St. Paul MN, US
Tien T. Wu - Woodbury MN, US
Mario A. Perez - Burnsville MN, US
Jeremie Peyras-Carratte - Pont Sainte Maxence, FR
Jean-Marie Coant - Saint-Denis, FR
Lahoussaine Lalouch - Noyon, FR

3M INNOVATIVE PROPERTIES COMPANY - ST. PAUL MN

D04H 13/00

428172, 428156, 264109, 264122, 264101

Nonwoven fibrous webs including randomly oriented discrete fibers defining a multiplicity of non-hollow projections extending from a major surface of the nonwoven fibrous web (as considered without the projections), and a plurality of substantially planar land areas formed between each adjoining projection in a plane defined by and substantially parallel with the major surface. In some exemplary embodiments, the randomly oriented discrete fibers include multi-component fibers having at least a first region having a first melting temperature and a second region having a second melting temperature, wherein the first melting temperature is less than the second melting temperature. At least a portion of the oriented discrete fibers are bonded together at a plurality of intersection points with the first region of the multi-component fibers. In certain embodiments, the patterned air-laid nonwoven fibrous webs include particulates. Methods of making and using such patterned air-laid nonwoven fibrous webs are also disclosed.

20130108831, May 2, 2013

Jul 6, 2011

13/808109

Tien T. Wu - Woodbury MN, US
Jimmy M. Le - St. Paul MN, US
David L. Vall - Woodbury MN, US
Gerry A. Hoffdahl - Scandia MN, US
Liming Song - Woodbury MN, US
Jean Le normand - Versailles, FR
Hendrik Both - Rijen, NL
Menno Prinsze - Etten-Leur, NL
John M. Brandner - St. Paul MN, US
Mario A. Perez - Burnsville MN, US
John W. Henderson - St. Paul MN, US

3M INNOVATIVE PROPERTIES COMPANY - ST. PAUL MN

D04H 1/736
D04H 1/54
B32B 5/08
B32B 5/26
B32B 5/02
B32B 3/26

428138, 428156, 428143, 428147, 428148, 428149, 428150, 428172, 428161, 264109

Nonwoven electret fibrous webs including randomly oriented discrete fibers comprising electret fibers, the webs including a multiplicity of non-hollow projections extending from a major surface of the nonwoven electret fibrous web, and a multiplicity of substantially planar land areas formed between each adjoining projection in a plane defined by and substantially parallel with the major surface. In some exemplary embodiments, the randomly oriented discrete fibers include multi-component fibers having at least a first region having a first melting temperature and a second region having a second melting temperature, wherein the first melting temperature is less than the second melting temperature. At least a portion of the oriented discrete fibers are bonded together at a plurality of intersection points with the first region of the multi-component fibers. In certain embodiments, the patterned air-laid nonwoven electret fibrous webs include particulates. Methods of making and using patterned electret fibrous webs are also disclosed.

20130146061, Jun 13, 2013

Dec 9, 2011

13/315881

John T. Tushaus - Oakdale MN, US
Tien T. Wu - Woodbury MN, US
Gerry A. Hoffdahl - Scandia MN, US

A62B 23/02
A62B 18/02

12820612, 156 622

A method of making a filtering face piece respirator, which method includes: providing a cup shaped mold ; providing a forming chamber where the mold is located and where loose fibers are introduced into air in the forming chamber ; causing the loose fibers to be accumulated on the mold in the forming chamber ; and bonding the accumulated fibers to each other at points of fiber intersection. The inventive method thus is beneficial in that it eliminates steps in the manufacturing process. The fibers also are uniformly distributed throughout the mask body, and because the webs do not have to be cut during respirator manufacture, less web waste is generated.

20130037481, Feb 14, 2013

Apr 14, 2011

13/641739

Lahoussaine Lalouch - Noyon, FR
Gerry A. Hoffdahl - Scandia MN, US
Tien T. Wu - Woodbury MN, US
Bret W. Ludwig - Oakdale MN, US
Bernard Vincent - Rueil Malmaison, FR
Jean Le normand - Versailles, FR
David L. Vall - Woodbury MN, US
Laurie L. Poluha - Woodbury MN, US
Jimmy M. Le - St. Paul MN, US

3M INNOVATIVE PROPERTIES COMPANY - St. Paul MN

B01D 39/00
B01D 39/14
B05D 5/00

210435, 427244, 210505, 2105021, 210504, 210489

Nonwoven fibrous webs including a multiplicity of discrete fibers, a population of sub-micrometer fibers having a population median diameter less than one micrometer adjoining the discrete fibers, and a multiplicity of chemically active particulates secured to the nonwoven fibrous web. In some embodiments, more than 0% and less than 10% wt. of the nonwoven fibrous web is made of discrete fibers that are thermoplastic polymeric fibers, and which optionally at least partially melt and coalesce to secure the discrete polymeric fibers to each other. In certain embodiments, at least some of the particulates are bonded to the thermoplastic polymeric fibers. In other embodiments, at least some of the particulates are secured within interstices of the fibrous web, without substantial bonding to the discrete fibers. Methods of making and using such nonwoven fibrous webs are also described.

20220364280, Nov 17, 2022

Jul 8, 2022

17/860715

- St. Paul MN, US
Tien Tsung WU - Woodbury MN, US
Gerry A. HOFFDAHL - Scandia MN, US
MingZhu LI - Shanghai, CN

D04H 1/4382
D04H 1/435
B29C 43/24
D04H 1/43
H01M 10/658
B29C 70/08

The provided articles and methods use a non-woven fibrous web containing 60-100 wt % of oxidized polyacrylonitrile fibers; and 0-40 wt % of reinforcing fibers having outer surfaces comprised of a polymer with a melting temperature of from 100 C. to 300 C. The non-woven fibrous web has an average bulk density of from 15 kg/mto 50 kg/m, with the plurality of fibers substantially entangled along directions perpendicular to a major surface of the non-woven fibrous web. Optionally, the oxidized polyacrylonitrile fibers can have a crimped configuration. Advantageously, these articles can display a combination of low thermal conductivity, high tensile strength, and flame resistance.

20220242089, Aug 4, 2022

Jun 9, 2020

17/595591

- St. Paul MN, US
Tien Tsung Wu - Woodbury MN, US
Nathan E. Schultz - Woodbury MN, US
Gerry A. Hoffdahl - Scandia MN, US

B32B 5/24
B32B 5/18
B32B 5/02
B32B 5/08
H01M 50/249
C08K 3/32
C08K 3/34
C08J 9/36

A flame retardant foam. The flame retardant foam includes a from 25 to 75 wt % polyvinyl alcohol foam; and a from 25 to 95 wt % fire retardant coated on the polyvinyl alcohol foam, wherein the fire retardant comprises ammonium polyphosphate or sodium metasilicate; wherein the thickness of the foam is from 2 mm to 1 cm.

20220227100, Jul 21, 2022

Jun 9, 2020

17/595597

- St. Paul MN, US
Tien Tsung Wu - Woodbury MN, US
Nathan E. Schultz - Woodbury MN, US
Gerry A. Hoffdahl - Scandia MN, US

B32B 5/26
H01M 50/249
B32B 5/02
B32B 5/08

A nonwoven fibrous web includes a flame retardant nonwoven fabric coated with a fire retardant, wherein the fire retardant comprises ammonium polyphosphate or alkali metal silicate; and wherein the flame retardant nonwoven fabric has a first major surface and an opposed second major surface; a first nonwoven fabric covering at least a portion of the first major surface; and a second nonwoven fabric covering at least a portion of the second major surface. The first and second nonwoven fabrics each comprise oxidized polyacrylonitrile fibers and optional reinforcing fibers.

20210283749, Sep 16, 2021

Sep 18, 2017

16/336157

- St. Paul MN, US
Grayce T. Huberty - St. Paul MN, US
Thomas J. Nelson - Woodbury MN, US
Ronald D. Apple - Apple Valley CA, US
Louis S. Moren - Oakdale MN, US
Robinette S. Alkhas - Winnetka CA, US
Nathan E. Schultz - Woodbury MN, US
Tien T. Wu - Woodbury MN, US
Gerry A. Hoffdahl - Scandia MN, US

B24D 11/00
C09K 3/14
B05D 1/00

Abrasive articles including a nonwoven fibrous substrate having a plurality of fibers, and a multiplicity of shaped abrasive particles, each shaped abrasive particle adhered to a corresponding fiber, each shaped abrasive particle having a length (L) and a width (W) determined in a direction substantially orthogonal to the length, the ratio of the length to the width defining an aspect ratio (L/W) of at least 1.1, each abrasive particle is oriented relative to its corresponding fiber, and more than 50% of the abrasive particles are oriented with respect to their corresponding fiber such that the abrasive particle length extends generally outwardly away from a surface of the corresponding fiber as determined visually using the Orientation Test. The shaped abrasive particles may have the geometric shape of a polygonal prism having two faces and at least three sides thereon. Methods of making the abrasive articles are also disclosed.