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Keywords: Karrickprocess1.png The image is from a USPTO document a government publication from 1934 From U S Patent 1 958 918 PD-USGov original upload log page en wikipedia Karrickprocess1 png 2006-04-28 01 30 Nagle 400×457×8 60167 bytes <nowiki>Image from U S patent 1 958 918 Uncopyrightable under US law </nowiki> 2006-04-21 12 27 Timharwoodx 387×518×1 8849 bytes <nowiki>The image is from a USPTO document a government publication from 1934 </nowiki> Chemical reactions Coal Petroleum production |