METHOD OF MAKING PLASTIC FILE FOLDER
United States Patent 3470290

Inventors:
Poris, Harry
Hendrie, George S.
Publication Date:
09/30/1969
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Assignee:
MACOID IND INC
Primary Class:
264/291
Other Classes:
402/80P, 264/339, 264/290.200, 281/29
International Classes:
B29C53/06; B42C7/00; B42F7/02; B29C59/04; B29C53/00; B42F7/00; B29D7/24; B29C17/02
US Patent References:
3350492Method for forming unitary polyolefin hinges
3383449Method for producing an endless filter string




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