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Kenneth L Smith, Tzu Li J Huang, James C Coderre: Flexible cube-corner retroreflective sheeting. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Karl G Hanson, September 12, 1995: US05450235 (153 worldwide citation)

A retroreflective article 10 has a body portion 14 and a multitude of cube-comer elements 12 that project from a rear side 20 of the body portion 14. The body portion 14 includes a body layer 18 that contains a light-transmissible polymeric material having an elastic modulus less than 7.times.10.sup ...


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Zayn Bilkadi, David C May: Retroreflective sheeting having an abrasion resistant ceramer coating. Minnesota Mining and Manufacturing Company, Karl G Hanson, October 14, 1997: US05677050 (89 worldwide citation)

Retroreflective sheeting having an abrasion-resistant ceramer coating that is prepared from about 20% to about 80% ethylenically unsaturated monomers; about 10% to about 50% of acrylate functionalized colloidal silica; and about 5% to about 40% N,N-disubstituted acrylamide or N-substituted-N-vinyl-a ...


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Alan D Rousseau, Marvin E Jones, Seyed A Angadjivand: Fibrous webs having enhanced electret properties. Minnesota Mining and Manufacturing Company, Carole Truesdale, Karl G Hanson, June 1, 1999: US05908598 (88 worldwide citation)

The present invention relates to a method of making a fibrous electret material which includes the steps of (1) forming a fibrous web of nonconductive thermoplastic fibers from a blend of nonconductive thermoplastic resin and an additive which is (a) a thermally stable organic compound or oligomer c ...


4
James E Springett, Leonard W Barrett: Respirator having thermochromic fit-indicating seal. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Karl G Hanson, April 8, 1997: US05617849 (84 worldwide citation)

Respirator 10 has a respirator body 11 that is configured to fit over the nose and mouth of a wearer. A thermochromic material 18 is positioned on the respirator body 11 such that the thermochromic material 18 makes thermal contact with the wearer's face when the respirator 10 is worn. The contact c ...


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Robert J Fleming, Joseph M McGrath, Christopher S Lyons: Retroreflective articles having polymer multilayer reflective coatings. 3M Innovative Properties Company, Robert J Pechman, Karl G Hanson, January 9, 2001: US06172810 (79 worldwide citation)

A retroreflective article that has a layer of optical elements and a multilayer reflective coating disposed on the optical elements. The reflective coating reflects light back into the optical elements so that it can be returned toward the light source. The multilayer reflective coating has multiple ...


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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 ...


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David Cook, Raymond Odell, Ian T Petherbridge, Pierre Legare, Robert P Lapointe, Kenneth J Krepel, David M Blomberg, Derek S Baker, James R Betz, Thomas I Insley: Apparatus and method for breathing apparatus component coupling. 3M Innovative Properties Company, Karl G Hanson, James L Young, June 10, 2003: US06575165 (76 worldwide citation)

The present invention relates to a fan-forced positive pressure breathing apparatus commonly known as a Powered Air Purifying Respirators (PAPR) system, and specifically concerns the connecting of the breathing components of such equipment. The invention is a method and apparatus for rapid engagemen ...


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James C Coderre: Cube-corner retroreflective articles. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Karl G Hanson, December 21, 1993: US05272562 (75 worldwide citation)

A retroreflective article (30, 50) has opaque pigment particles (38, 58) dispersed in a retroreflective region (33, 53) of a front portion (35, 55) of a sheeting (32, 52) that includes a body portion (34, 54) and a multitude of cube-corner elements (36, 56). The opaque pigment particles (38, 58) sca ...


9
Daniel A Japuntich, Vaughn B Grannis, Harold J Seppala, Anthony B Ferguson: Unidirectional fluid valve. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Karl G Hanson, July 5, 1994: US05325892 (72 worldwide citation)

An exhalation valve 14 for a filtering face mask 10 has a flexible flap 24 that makes contact with a curved seal ridge 30 of a valve seat 26 when the valve 14 is in the closed position. The curvature of the seal ridge 30 corresponds to a deformation curve exhibited by the flexible flap 24 when secur ...


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