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Patent Protection Ended

No. Patent No. Title
7941. PI 90002252 THREE DIGIT CHANNEL ENTRY SYSTEM.
7942. PI 90002253 QUASI-PARALLEL IF WITH SHARED SAW FILTER.
7943. PI 90002254 AMPLIFIER HAVING MAXIMUM SUMMED POWER FROM A PLURALITY IF DEVICES HAVING LIMITED CURRENT SINKING CAPABILITY.
7944. PI 90002255 EXPANSION JOINT FOR BRIDGE STRUCTURE.
7945. PI 90002257 A DYE FOR COLORING CIGARETTE PAPER.
7946. PI 90002258 THERMOPLASTIC POLYESTER SERIES RESIN FOAMED MATERIAL AND PRODUCTION PROCESS THEREOF.
7947. PI 90002260 PROCESS FOR PREPARING GRANULAR POLYARYLENE SULFIDES HAVING HIGH MOLECULAR WEIGHT.
7948. PI 90002261 DISC TRAY LOADING MECHANISM.
7949. PI 90002265 TIP SEAL FOR SCROLL COMPRESSOR.
7950. PI 90002266 PROCESS FOR THE PREPARATION OF FIRE-RETARDANT EXPANDA- BLE THERMOPLASTIC BEADS.
7951. PI 90002267 AQUEOUS HIGH CONCENTRATION COMPOSITION OF ALPHA-SULFOFA -TTY ACID ESTER SALT.
7952. PI 90002268 ACTUATING DEVICE FOR DRIVE SWITCH OF FRONT-LOADING TYPE VCR.
7953. PI 90002270 LOADING POLE DRIVE MECHANISM FOR MAGNETIC TAPE RECORDING/REPRODUCING APPARATUS.
7954. PI 90002271 SOLID CATALYST COMPONENTS FOR OLEFIN POLYMERIZATION AND PROCESSES FOR THE POLYMERIZATION OF OLEFIN USING SAME.
7955. PI 90002274 REFILLABLE POLYESTER CONTAINER AND PREFORM FOR FORMING THE SAME.
7956. PI 90002275 SEPARABLE FASTENING DEVICE,
7957. PI 90002276 PHOTOGRAPHIC FILM PROCESSING.
7958. PI 90002277 INTERPROXIMAL BRUSH.
7959. PI 90002280 METHOD OF CONSTRUCTING AN ELEVATED ROADWAY
7960. PI 90002281 PROCESS FOR TREATING THE SURFACE OF A FLUORESCENT MATERIAL.