Simpson Technologies Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5967654 Core sand preparation apparatusExpiredMar 28, 97Oct 19, 99[B28C, B67D]
5724257 Foundry sand testing apparatus and systemExpiredApr 19, 96Mar 03, 98[G01N]
5664699 Core sand preparation apparatusExpiredApr 04, 95Sep 09, 97[B05D, B67D]
4368984 Mixer apparatusExpiredDec 12, 77Jan 18, 83[B22C]
4190369 Method and apparatus for making moldsExpiredJul 14, 78Feb 26, 80[B28C]

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