United States Patent 2980982
Inventors:
Costa, John E.
Boeuf, Edgar LE. W.
Lefevre, Lloyd E.
Publication Date:
04/25/1961
Assignee:
DOW CHEMICAL CO
Other Classes:
264/DIG.047, 428/394, 28/103, 28/106
International Classes:
D01D5/42; D01G37/00; D01D5/00