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Patent Protection Ended

No. Patent No. Title
4681. PI 89000230 PROCESS FOR WELDING TUBES AND STAYS TO MAKE A GAS- TIGHT TUBE WALL.
4682. PI 89000232 CIRCUIT ARRANGEMENT FOR LINEARLY AMPLYING AND DEMODULATING AN AM-MODULATED SIGNAL, AND INTEGRATED SEMICONDUCTOR ELEMENT FOR SAID CIRCUIT ARRANGEMENT.
4683. PI 89000233 COMPATIBLE WIDESCREEN TV/EXTENDED DEFINITION WIDESCREEN TELEVISION SYSTEM USING PLURAL SIGNAL TRANSMISSION CHANNELS.
4684. PI 89000234 COMPATIBLE WIDESCREEN TV/WIDESCREEN TELEVISION SIGNAL PROCESSING SYSTEM WITH CENTER AND SIDE PANEL IMAGE RESOLUTION UNIFORMITY.
4685. PI 89000235 PROCESS FOR REMOVING H2S FROM A GAS STREAM
4686. PI 89000237 INITIALIZATION OF COMMUNICATION CHANNEL BETWEEN A SUBSCRIBER STATION AND A BASE STATION IN A SUBSCRIBER COMMUNICATION SYSTEM
4687. PI 89000238 PARTIAL WASHING DEVICE.
4688. PI 89000239 A GARBAGE CONVEYING APPARATUS.
4689. PI 89000240 LACTAM DERIVATIVES.
4690. PI 89000243 DISPENSING DEVICE
4691. PI 89000244 PNEUMATIC TIRE
4692. PI 89000246 A METHOD FOR MANUFACTURING A ROTOR FRAME OF AN ELECTROMAGNETIC CLUTCH.
4693. PI 89000247 A CHUCK OF A LATHE CLAMPING A DISCOID PORTION OF A WORK
4694. PI 89000248 A RESEALABLE DISPENSER-CONTAINER FOR WET TISSUES.
4695. PI 89000249 QUATERNARY AMMONIUM COMPOUNDS FOR USE IN BLEACHING SYSTEMS.
4696. PI 89000251 COIN DISCRIMINATOR
4697. PI 89000252 GAS/LIQUID CONTACTING APPARATUS.
4698. PI 89000253 INTERLOCKED ZOOMING APPARATUS FOR USE IN STEREOSCOPIC CAMERAS
4699. PI 89000254 PROCESS FOR THE CLOSURE & SUBSEQUENT OPENING OF STERILIZABLE CONTAINERS, OPERCULAR COVERS USED IN CARRYING OUT SAID PROCESS AND PROCESS FOR MANUFACTURING SAID OPERCULAR COVERS.
4700. PI 89000255 4-SUBSTITUTED PYRAZOLO (3,4-D) PYRIMIDINE DERIVATIVES.