1
Harvey J Berg: Molded fibrous filtration products. Minnesota Mining and Manufacturing Company, Donald M Sell, James A Smith, Roger R Tamte, August 20, 1985: US04536440 (171 worldwide citation)

Molded filtration products, such as disposable face masks, are prepared by assembling at least one fibrous shaping layer and one fibrous filtration layer in face-to-face contact and subjecting the assembly to heat and molding pressure. Preferably the assembly comprises two shaping layers, one on eac ...


2
Berg Harvey J Minnesota Mining: Molded fibrous filtration products.. Minnesota Mining & Mfg, November 27, 1985: EP0162546-A1 (3 worldwide citation)

Molded filtration products, such as disposable face masks, are prepared by assembling at least one fibrous shaping layer and one fibrous filtration layer in face-to-face contact and subjecting the assembly to heat and molding pressure. Preferably the assembly comprises two shaping layers, one on eac ...


3
Berg Harvey J: Produits filtrants fibreux moules, Molded fibrous filtration products. Minnesota Mining And Manufacturing Company, SMART & BIGGAR, April 11, 1989: CA1252396

Abstract of the Disclosure Molded filtration products, such as disposableface masks, are prepared by assembling at least one fibrousshaping layer (14, 16)and one fibrous filtration layer (15)in face-to-face contact and subjecting the assembly to heatand molding pressure. Preferably the assembly comp ...