E21F 5/12

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
2020/0109,629 NON-CAKING MINE ROCK DUST FOR USE IN UNDERGROUND COAL MINESDec 05, 19Apr 09, 20Not available
2017/0159,437 NON-CAKING MINE ROCK DUST FOR USE IN UNDERGROUND COAL MINESFeb 14, 17Jun 08, 17IMERYS USA, INC.
2015/0037,496 TREATMENTS FOR NON-CAKING MINE ROCK DUSTOct 21, 14Feb 05, 15IMERYS PIGMENTS, INC.
2015/0008,369 NON-CAKING ROCK DUST FOR USE IN UNDERGROUND COAL MINESMay 19, 14Jan 08, 15IMERYS USA, INC.