ORTECH CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5875817 Digital gas metering system using tri-stable and bi-stable solenoidsExpiredAug 19, 96Mar 02, 99[F16K]
5851002 Tri-stable solenoid-operated valveExpiredAug 06, 96Dec 22, 98[F16K]
5568801 Plasma arc ignition systemExpiredMay 20, 94Oct 29, 96[F02P]
5551387 Tuned intake manifold for OTTO cycle enginesExpiredFeb 24, 95Sep 03, 96[F02M]
5290525 Removal of base metals and cyanide from gold-barren CIP solutionsExpiredSep 14, 92Mar 01, 94[C01G]
5232606 Process for recycling of supported or contaminated PVCExpiredApr 21, 92Aug 03, 93[B01P]
5055179 Upgrading heavy oilExpiredJun 13, 89Oct 08, 91[C10G]
4826320 Dither signal remover for a dithered ring laser angular rate sensorExpiredMay 24, 85May 02, 89[G01C]
4813233 Diesel particulate trapsExpiredJun 30, 86Mar 21, 89[F01N]
4810431 Method of manufacturing plastic particles for a particle displayExpiredMay 26, 87Mar 07, 89[B22D]
4703007 Separation of volatiles from aqueous solutions by gas strippingExpiredMar 27, 85Oct 27, 87[C12M]
4685291 Diesel particulate trapsExpiredJun 30, 86Aug 11, 87[F01N]
4671059 Diesel particulate trapsExpiredJun 30, 86Jun 09, 87[F01N]
4459252 Method of forming a small bore flexible vascular graft involving eluting solvent-elutable particles from a polymeric tubular articleExpiredFeb 23, 82Jul 10, 84[B29D]
4355426 Porous flexible vascular graftExpiredNov 20, 79Oct 26, 82[A61F]

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