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University of North Dakota Energy and Environment Research Center Patents
University of North Dakota Energy and Environment Research Center
Grand Forks, ND
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Patent Number Title Of Patent Date Issued
5254521 Leonardite char adsorbents October 19, 1993
A process of preparing lignite (low rank) coal filter material, suitable for use in lieu of more expensive activated carbon filter materials, is disclosed. The process comprises size reducing Leonardite coal material to a suitable filtering effective size, and thereafter heating the size

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