Title:
Fibrous unit
United States Patent 2521984

Inventors:
Lang, Philip H.
Publication Date:
09/12/1950
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Assignee:
AMERICAN FELT COMPANY
Primary Class:
55/486
Other Classes:
156/251, 156/581, 156/220, 55/528, 210/484, 55/529, 55/514, 29/4.550
International Classes:
B01D39/16; D04H1/00
US Patent References:
2147792Filter
2159121Filter tip for cigarettes
2232640Method of making articles from heat fusible sheet material
2264829Respirator
2389435Filter material
2433531Milk filter
2438771Garment protector