Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1989-03-01
1989-11-28
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156223, 156224, 156226, 156257, 156268, 156292, B32B 3116
Patent
active
048835471
ABSTRACT:
The invention provides a filtration face mask which has an expanded filtration surface area and high filter efficiency. The mask includes at least two sidewall portions generally extending away from the face of the wearer and away from an annular base. A frontal portion bridges the sidewall portions and at least two supporting arche structures are disposed at the junction of the sidewall and frontal portions.
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Ball Michael W.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Tamte Roger R.
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