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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4772560 Laminated wafer for sensing and monitoring exposure to gasesExpiredMay 19, 86Sep 20, 88[G01N, C01G]
4597769 Coal demineralization and depyritization processExpiredMar 11, 85Jul 01, 86[C10L]
4465493 Desulfurization process for coal and other carbonaceous materialsExpiredDec 28, 81Aug 14, 84[C10L]

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