LIAOHE PETROLEUM EXPLORATION BUREAU

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
7754102 Method for reclaim of carbon dioxide and nitrogen from boiler flue gasExpiredNov 09, 07Jul 13, 10[C01B]
5957197 Downhole cut-off valve used for cementingExpiredMay 02, 97Sep 28, 99[E21B]
5731517 Measuring device used in a four-parameter measuring system and in a high temperature and high pressure conditionExpiredJul 18, 96Mar 24, 98[G01K, E21B]

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