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Patent Protection Ended

No. Patent No. Title
3141. PI 87003018 PREVENTING FLUID MIGRATION AROUND A WELL CASING
3142. PI 87003019 PRODUCTION OF GAS MIXTURES CONTAINING HYDROGEN AND CARBON MONOXIDE
3143. PI 87003020 ACOUSTIC LAGGING DEVICE
3144. PI 87003021 DRILLING FLUID
3145. PI 87003023 HEAT FUMIGATION APPARATUS
3146. PI 87003025 NOVEL &-CHLOROKETONE DERIVATIVE AND PROCESS FOR PREPARATION THEREOF
3147. PI 87003026 4-CYANO-4-(FLUROPHENYL)-3-(SUBSTITUTED PHENYL)-BUTYRIC ACIDS, ESTERS AND DERIVATIVES THEREOF, AND A METHOD OF SELECTIVELY CONTROLLING UNDESIRABLE VEGETATION IN RICE THEREWITH
3148. PI 87003027 WEIR MADE OF FLEXIBLE SHEET AND CAPABLE OF BEING SET UP AND DOWN
3149. PI 87003028 WEIR MADE OF FLEXIBLE SHEET AND CAPABLE OF BEING SET UP AND DOWN
3150. PI 87003029 BUILDING BLOCKS
3151. PI 87003030 SECURITY RECEPTACLES
3152. PI 87003031 METHOD FOR ELIMINATING REENTRY DISULFIDES, IN A MERCAPTAN EXTRACTION PROCESS
3153. PI 87003034 AGENT FOR THE REGULATION OF THE APPETITE OR SLEEPING AGENT
3154. PI 87003035 CHOCOLATE ADDITIVE, CHOCOLATE, AND PROCESS FOR PRODUCING CHOCOLATE
3155. PI 87003036 DEVICE FOR CONNECTING CABLE WIRES TO CUTTING/CLAMPING CONTACTS OF DROPWIRE CONNECTOR BANKS OF TELECOMMUNICATION SYSTEMS
3156. PI 87003037 MATTRESS WITH AERATION CAVITIES
3157. PI 87003038 DEVICE FOR THE HEAT EXCHANGE BETWEEN A RECYCLE GAS LEAVING AN NH3 CONVERTER AND WATER.
3158. PI 87003040 NOVEL QUINALDINAMIDE DERIVATIVES AND THEIR PREPARATIONS
3159. PI 87003043 SOFTENING DETERGENT COMPOSITIONS CONTAINING SPECIFIC POLY-AMIDE SOFTENING AGENT
3160. PI 87003046 FURNACE FOR THE SELECTIVE INCINERATION OR CARBONIZATION OF WASTE MATERIALS