1
Seyed A Angadjivand, Marvin E Jones, Daniel E Meyer: Method of charging electret filter media. Minnesota Mining and Manufacturing Company, Gary L Griswold, Walter N Kirn, Carole Truesdale, March 5, 1996: US05496507 (180 worldwide citation)

A method of charging a nonwoven web of thermoplastic microfibers to provide electret filter media is provided. The method includes impinging on a nonwoven web of thermoplastic nonconductive microfibers capable of having a high quantity of trapped charge jets of water or a stream of water droplets at ...


2
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 ...


3
Alan D Rousseau, Marvin E Jones, Seyed A Angadjivand: Electret filter media containing filtration enhancing additives. Minnesota Mining and Manufacturing Company, Karl G Hanson, Carole Truesdale, November 2, 1999: US05976208 (47 worldwide citation)

Electret filter media comprising a fibrous web of a blend of a thermoplastic resin and at least one compound or oligomer that enhances the web's electret properties.


4
Seyed A Angadjivand, Marvin E Jones, Daniel E Meyer: Electret filter media. Minnesota Mining and Manufacturing Company, Carole Truesdale, Karl G Schwappach, Karl G Hanson, September 19, 2000: US06119691 (46 worldwide citation)

An electret filter media, and mask, that is made of a nonwoven web of thermoplastic microfibers. The thermoplastic microfibers are of substantially the same composition, are nonconductive, and have an effective fiber diameter less than about 15 micrometers. The nonwoven web also has sufficient unpol ...


5
John M Brandner, William J Kopecky, Seyed A Angadjivand, James E Springett, Timothy J Lindquist: Monocomponent monolayer meltblown web and meltblowing apparatus. 3M Innovative Properties Company, Kenneth B Wood, March 8, 2011: US07902096 (43 worldwide citation)

A porous monocomponent nonwoven web contains a bimodal mass fraction/fiber size mixture of intermingled continuous microfibers and larger size fibers of the same polymeric composition. There are at least five times as many microfibers as larger size fibers, and a histogram of the mass fraction of fi ...


6
Alan D Rousseau, Marvin E Jones, Seyed A Angadjivand: Fibrous webs useful for making electret filter media. Minnesota Mining and Manufacturing Company, Carole Truesdale, Karl G Hanson, October 19, 1999: US05968635 (41 worldwide citation)

Fibrous webs comprising a blend of a thermoplastic resin and at least one compound or oligomer which is ##STR1## wherein R.sub.f is a perfluorinated moiety which may contain one or more catenary ether oxygen atoms, Q is a linking group selected from alkylene groups having 1 or 2 carbon atoms, sulfon ...


7
Andrew R Fox, John D Stelter, Seyed A Angadjivand, William T Fay, Michael R Berrigan, Douglas C Sundet: Pleated filter with monolayer monocomponent meltspun media. 3M Innovative Properties Company, Kenneth B Wood, May 24, 2011: US07947142 (39 worldwide citation)

A pleated filter is made from a monocomponent monolayer nonwoven web of continuous monocomponent meltspun partially crystalline and partially amorphous oriented fibers of the same polymeric composition that are bonded to form a coherent and handleable web having a Gurley Stiffness of at least 100 mg ...


8
Alan D Rousseau, Marvin E Jones, Seyed A Angadjivand: Composition useful for making electret fibers. Minnesota Mining and Manufacturing Company, Carole Truesdale, Karl Hanson, July 6, 1999: US05919847 (39 worldwide citation)

A composition comprising a blend of a thermoplastic resin and at least one compound or oligomer which is ##STR1## wherein R.sub.f is a perfluorinated moiety which may contain one or more catenary ether oxygen atoms, Q is a linking group selected from alkylene groups having 1 or 2 carbon atoms, sulfo ...


9

10
Seyed A Angadjivand, Marvin E Jones, Daniel E Meyer: Electret filter media and filtering masks that contain electret filter media. Minnesota Mining and Manufacturing Company, Karl Hanson, August 31, 2004: US06783574 (34 worldwide citation)

Electret filter media comprising a nonwoven web of thermoplastic nonconductive microfibers having trapped charge, said charge provided by (1) subjecting the nonwoven web to a corona treatment, followed by (2) impingement of jets of water or a stream of water droplets on the web at a pressure suffici ...