Patent Protection Ended
| No. | Patent No. | Title |
| 4541. | PI 89000019 | A POLYSTYRENE RESIN COMPOSITION HAVING IMPROVED STIFFNESS |
| 4542. | PI 89000022 | EARTH STABILISATION |
| 4543. | PI 89000023 | EARTH STABILITION |
| 4544. | PI 89000024 | FLAME RESISTANT POLYAROMATIC CYANATE RESINS WITH IMPROVED THERMAL STABILITY |
| 4545. | PI 89000025 | THE USE OF N-SUBSTITUTED-5, 6-DIHYDROXYINDOLES AS A HAIR COLORING AGENT. |
| 4546. | PI 89000027 | WASTE MATERIAL COLLECTING BIN. |
| 4547. | PI 89000030 | MODIFIED ADVANCED EPOXY RESINS |
| 4548. | PI 89000031 | IMPROVEMENTS IN PAPER FOR USE IN XEROGRAPHIC IMAGING PROCESSES |
| 4549. | PI 89000032 | SCREEN PRINTING DEVICE FOR CYLINDRICAL OBJECTS |
| 4550. | PI 89000034 | METHOD FOR STABILIZING CONCRETE RESIDUES. |
| 4551. | PI 89000035 | FLAME-RETARDANT RESIN COMPOSITION. |
| 4552. | PI 89000036 | POLYMERIC PARTICLES AND THEIR PREPARATION. |
| 4553. | PI 89000037 | DETERGENT COMPOSITIONS. |
| 4554. | PI 89000038 | SURFACTANT INHIBITION OF DENTAL PLAQUE. |
| 4555. | PI 89000039 | SALAD/COOKING OIL BALANCED FOR HEALTH BENEFITS |
| 4556. | PI 89000041 | ANTIGEN ANTIBODY CONJUGATE. |
| 4557. | PI 89000042 | A DIRLLING TOOL. |
| 4558. | PI 89000043 | OBJECTIVE LENS DRIVEING APPARATUS |
| 4559. | PI 89000044 | DETERGENT COMPOSITION CONTAINING PERFUME |
| 4560. | PI 89000045 | POLYMERIC CASING WITH TEXTURED SURFACE |
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