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CIGARETTE FILTER
US 3,460,543 A
Filed
: 03/21/1966
Issued
: 08/12/1969
Est. Priority Date
: 03/21/1966
Status: Expired due to Term
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28
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28 Citations
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Current Assignee
Charles H. Keith
,
William W. Bates Jr
Original Assignee
Charles H. Keith
,
William W. Bates Jr
Inventors
Keith, Charles H.
,
Bates, William W. Jr.
Application Number
US04/535,739
Time in Patent Office
1,240 Days
Field of Search
US Class Current
131/342
CPC Class Codes
A24D 3/16
of inorganic materials
A24D 3/163
Carbon
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