Recovery of oil from tar sands
United States Patent 2871180

Inventors:
Lowman Jr., Malden C.
Fisch, Edwin J.
Publication Date:
01/27/1959
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Assignee:
Shell, Dev
Primary Class:
208/390
Other Classes:
208/428, 208/425, 208/391, 208/45
International Classes:
C10G1/00
Foreign References:
CA488928A