The Metropolitan Sanitary District of Greater Chicago

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4804631 Method and apparatus for measuring cyanideExpiredMay 02, 86Feb 14, 89[G01N]
4413419 Method and apparatus for remote measuringExpiredMay 12, 82Nov 08, 83[G01B]
4367652 Method and apparatus for monitoring wastewaterExpiredJul 07, 80Jan 11, 83[G01F]
4265857 In-line distillation systemExpiredNov 16, 78May 05, 81[B01L, G01N, B01D]
4216671 Automatic cleaning of sensing probesExpiredDec 11, 75Aug 12, 80[B08B, G01N]

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