Patent Protection Ended
| No. | Patent No. | Title |
| 3961. | PI 88000829 | CAN WITH DOMED BOTTOM STRUCTURE |
| 3962. | PI 88000830 | WATER-PROOF CONNECTOR |
| 3963. | PI 88000832 | RESIN COMPOSITION FOR SPACERS OF INFORMATION RECORDING DISC |
| 3964. | PI 88000833 | ELECTROLYTIC CELL APPARATUS |
| 3965. | PI 88000834 | FILM DISPENSER |
| 3966. | PI 88000835 | DOWNHOLE CIRCULATION VALVE |
| 3967. | PI 88000836 | INSECTICIDAL COMPOUNDS - CHARACTERISED BY ENHANCED KNOCKDOWN EFFECT. |
| 3968. | PI 88000837 | FLUID BARRIER SEAL FOR SANITARY NAPKIN HAVING UNDERGARMENT PROTECTING FLAPS |
| 3969. | PI 88000840 | SPIN-ON GLASS FOR USE IN SEMICONDUCTOR PROCESSING |
| 3970. | PI 88000841 | CONNECTING DEVICE FOR SHUTTERING PANELS |
| 3971. | PI 88000844 | FILM DISPENSER |
| 3972. | PI 88000845 | ALPHA-HALOPYRUVATE OXIME |
| 3973. | PI 88000846 | METHOD OF MAGNETIZING WILL TUBULARS |
| 3974. | PI 88000849 | METAL PLATE OF PART MOUNTING DEVICE AND PROCESS FOR PRODUCING THE SAME |
| 3975. | PI 88000850 | THE HOMOGENEOUS PARTIAL OXIDATION OF A METHANE- CONTAINING PARAFFINIC HYDROCARBON. |
| 3976. | PI 88000851 | NEGATIVE PHOTORESIST SYSTEMS |
| 3977. | PI 88000852 | CONDUCTING OR CATALYSING A CHEMICAL REACTION ON A SURFACE ESPECIALLY ELECTROLESS METAL DEPOSITION AND CATALYST SYSTEMS USED THEREIN |
| 3978. | PI 88000853 | PHOTOSENSITIVE COATING COMPOSITIONS,THERMALLY STABLE COATINGS PREPARED FROM THEM, AND THE USE OF SUCH COATNGS IN FORMING THERMALLY STABLE POLYMER IMAGES |
| 3979. | PI 88000855 | INTERMEDIATE FREQUENCY CONVERTER CIRCUIT FOR MULTIPLEX BROADCASTING TV RECEIVER |
| 3980. | PI 88000856 | SOUND TRAP CIRCUIT FOR MULTIPLEX BROADCASTING TV RECEIVER |
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