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US 6,742,518 B2Granted
Respirator filter
OwnerWen-Tsung Changinventor
Life of this patent
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Abstract
An improved structure of respirator filter comprised of a laminated layers of fireproof fabric, static fibers, active carbon fibers and non-woven filter cotton; interlaced with airflow guides in among the layers of the filter; a hole or multiple holes being respectively provided at the center or in the peripheral of another airflow guide so to create air conduction for increasing area and time for the gas to contact the filter for improved smoke and toxicity filtration effects.
Claims1
A structure of a respirator filter essentially consisting of a first layer of fireproof fabric, a second layer of static fiber mounted under said first layer;
- a third layer of a high density film mounted under said second layer and having a center hole, a fourth layer of active carbon fiber mounted under said third layer, a fifth layer made of high density film and having a plurality of peripheral holes, a sixth layer of active carbon fiber, a seventh layer made of high density film and having a center hole, and an eighth layer made of non-woven filter cotton.
Dependencies are inferred from the claim text.