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Patent Protection Ended

No. Patent No. Title
4661. PI 89000200 DRILLING NUDS AND OIL WELL CEMENT SLURRIES.
4662. PI 89000203 PIGMENTABLE BINDER COMPOSITION.
4663. PI 89000204 MECHANISM FOR WRITING INSTRUMENTS AND WRITING INSTRUMENTS EQUIPPED WITH SUCH MECHANISM.
4664. PI 89000205 EXPLOSIVE COMPOSITION.
4665. PI 89000206 EXPLOSIVE COMPOSITION.
4666. PI 89000207 WHEEL ASSEMBLY & METHOD OF FORMING SUCH ASSEMBLY.
4667. PI 89000209 PROCESS FOR THE PRODUCTION OF PHTHALAZINEACBTIC ACID ESTER DERIVATIVES AND A NOVEL INTERMEDIATE.
4668. PI 89000210 SUBSTITUTED 4-AMINOQUINOLINE DERIVATIVES AS GASTRIC ACID SECRETION INHIBUTORS.
4669. PI 89000211 PROCESS FOR COLORING HAIR WITH AMINOALKYL OR AMINOHYDROXYALKYL CATECHOL COMPOSITIONS.
4670. PI 89000213 A DEVICE FOR DELIVERING A FLUID SAMPLE TO A DIAGNOSTIC DEVICE AT A CONTROLLED RATE.
4671. PI 89000214 ELECTRICAL CONNECTOR.
4672. PI 89000215 COATED GRANULAR FERTILIZERS.
4673. PI 89000217 INSTANTLY STABLE, QUICKLY ERACTABLE AND QUICKLY COLLAPSIBLE PORTABLE STRUCTURE .
4674. PI 89000219 PREPARATION OF PASTA .
4675. PI 89000220 LIGHT-RECHARGEABLE BATTERY .
4676. PI 89000222 GANG POT MOULD .
4677. PI 89000223 GANG POT MOULD .
4678. PI 89000224 CONNECTOR FOR TUBULAR POLES OF A DOME-TYPE TENT .
4679. PI 89000225 RESISTIVE METAL LAYERS AND METHOD FOR MAKING SAME .
4680. PI 89000227 STRUCTURAL GENE COMPRISING DNA CODING FOR AN ENDOTOXIN PROTEIN HAVING TOXIC ACTIVITY AGAINST INSECTS.