Method of changing the bulk density of powdered materials
United States Patent 2896263

Inventors:
Frederick, Edward R.
Bartholomew, George A.
Publication Date:
07/28/1959
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Assignee:
ALBANY FELT CO
Primary Class:
Other Classes:
361/212, 428/357, 425/174.80E, 23/313R, 264/DIG.045, 264/117, 361/213, 425/174, 419/62, 419/30
International Classes:
B01J2/00
US Patent References:
2641025Apparatus and method for drafting fibers
Foreign References:
GB190022372A