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5
tated until the evolution of sulfurous-acid gas ceases, an agitation of the treated oil with an alkali and a hydrogen - producing metal until in a test portion dilute sulfuric acid 5 ceases to generate nitrous acid, a washing of the treated oil with water to remove free ammonia therefrom, the subsequent washing of the oil with dilute sulfuric acid until the oil fails to color said acid to remove the formed
basic compounds, and the distillation of the 10 oil; substantially as specified. In witness whereof I affix my signature in presence of two witnesses. FELIX C. THIELE. Witnesses: H. HILLEBRAND, JNO. HILLEBRAND.
Thiele, Felix C.Process of Refining Crude Mineral Oils and their Distillates.,
patent,
September 24, 1901;
[Washington D.C.].
(https://texashistory.unt.edu/ark:/67531/metapth515000/m1/5/:
accessed April 24, 2024),
University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu;
crediting UNT Libraries Government Documents Department.