1
James F Dyrud, Harvey J Berg, Alice C Murray: Resilient shape-retaining fibrous filtration face mask. Minnesota Mining and Manufacturing Company, Donald M Sell, Roger R Tamte, February 28, 1989: US04807619 (136 worldwide citation)

New molded fibrous filtration face masks that are highly resilient and shape-retaining are provided using one or more molded fibrous shaping layers, with a fibrous filtration layer disposed on one side of or between the molded fibrous shaping layers; the molded fibrous shaping layers having a total ...


2
Jerome W McAllister, Kevin E Kinzer, James S Mrozinski, Eric J Johnson, James F Dyrud: Particle-filled microporous materials. Minnesota Mining and Manufacturing Company, Donald M Sell, Walter N Kirn, Carole Truesdale, September 18, 1990: US04957943 (82 worldwide citation)

A microporous particulate-filled thermoplastic polymeric article is provided. The article can be in the form of a film, a fiber, or a tube. The article has a thermoplastic polymeric structure having a plurality of interconnected passageways to provide a network of communicating pores. The microporou ...


3
Dennis L Krueger, James F Dyrud: Respirator comprised of blown bicomponent fibers. Minnesota Mining and Manufacturing Company, Donald M Sell, James A Smith, Roger R Tamte, March 8, 1988: US04729371 (79 worldwide citation)

Fibrous webs of bicomponent fibers are made by extruding a layered molten mass through a row of side-by-side orifices into a high-velocity gaseous stream. Bicomponent fibers of small size can be obtained, and the webs offer unique properties.


4
Joseph P Kronzer, Roger J Stumo, James F Dyrud, Harvey J Berg: Methods of forming fibrous filtration face masks. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Karl G Hanson, May 3, 1994: US05307796 (77 worldwide citation)

A method of forming a cup-shaped, non-woven fibrous shaping layer for a filtering face mask. The method includes the steps: (a) heating a non-woven fibrous web that contains at least 40 weight percent thermally bonding fibers, where at least 10 weight percent of the fibrous material is bicomponent f ...


5
Seyed Abolhassan Angadjivand, Tammy M Chalmers, James F Dyrud, Simon A Mortimer, Scott J Tuman, Cynthia Y Tamaki, Graham J Bostock: Respiratory mask having comfortable inner cover web. 3M Innovative Properties Company, Cecilia Hill, Karl G Hanson, March 28, 2000: US06041782 (63 worldwide citation)

A respiratory mask 1 has a molded, cup-shaped, shape-retaining shell 10 on the concave side of which is a layer of filter material 11 and, on the concave side of the filter material, without any intermediate shape-retaining layer, a layer of nonwoven material 12. The layer of filter material 11 and ...


6
Graham J Bostock, John W Bryant, Desmond T Curran, Christopher P Henderson, Dennis L Krueger, James F Dyrud: Flat-folded personal respiratory protection devices and processes for preparing same. 3M Innovative Properties Company, James A Rogers, September 26, 2000: US06123077 (50 worldwide citation)

Fold-flat personal respiratory protection devices are provided. The devices have a flat central portion having first and second edges, a flat first member joined to the first edge of the central portion through either a fold-line, seam, weld or bond, said fold, bond, weld or seam of the first member ...


7
Graham J Bostock, John W Bryant, Desmond T Curran, Christopher P Henderson, Dennis L Krueger, James F Dyrud: Flat-folded personal respiratory protection devices and processes for preparing same. 3M Innovative Properties Company, Karl G Hanson, November 26, 2002: US06484722 (39 worldwide citation)

Fold-flat personal respiratory protection devices are provided. The devices have a flat central portion having first and second edges, a flat first member joined to the first edge of the central portion through either a fold-line, seam, weld or bond, said fold, bond, weld or seam of the first member ...


8
John W Bryant, Desmond T Curran, James F Dyrud, Christopher P Henderson, Harold J Seppala, Elfed I Williams: Multi-part headband and respirator mask assembly and process for making same. Minnesota Mining and Manufacturing Company, James A Rogers, March 10, 1998: US05724677 (37 worldwide citation)

A multi-part headband attachable to a face mask blank and a method of attaching the same. The multi-part headband has a unit length corresponding to the distance between the attachment locations as measured along a surface of the face mask blank or along an axis intersecting the attachment locations ...


9
Dennis L Krueger, James F Dyrud: Web of biocomponent blown fibers. 3M Innovative Properties Company, Roger R Tamte, May 2, 2000: US06057256 (35 worldwide citation)

Fibrous webs of bicomponent fibers are made by extruding a layered molten mass through a row of side-by-side orifices into a high-velocity gaseous stream. Bicomponent fibers of small size can be obtained, and the webs offer unique properties.


10
John W Bryant, Desmond T Curran, James F Dyrud, Christopher P Henderson, Harold J Seppala, Elfed I Williams: Multi-part headband and respirator mask assembly and process for making same. 3M Innovative Properties Company, James A Rogers, November 21, 2000: US06148817 (31 worldwide citation)

A multi-part headband attachable to a face mask blank and a method of attaching the same. The multi-part headband has a unit length corresponding to the distance between the attachment locations as measured along a surface of the face mask blank or along an axis intersecting the attachment locations ...