Patent Protection Ended
| No. | Patent No. | Title |
| 4521. | PI 88001615 | FILTRATION |
| 4522. | PI 88001616 | HEAT STABLE FLUORINATED POLYORGANOSILOXANE COMPOSITIONS |
| 4523. | PI 88001617 | IMPROVEMENT IN ALARM CONTROL MECHANISMS |
| 4524. | PI 88001618 | NANBV DIAGNOSTICS AND VACCINES |
| 4525. | PI 88001619 | ERGOLINE DERAVATIVES, PROCESSES FOR THEIR PREPARATION AND PHARMACEUTICAL COMPOSITIONS CONTAINING SAME. |
| 4526. | PI 88001620 | PIPERAZIN-L-YL-ERGOLINE DERIVATIVES, PROCESS FOR PREPARING THEM AND PHARMACEUTICAL COMPOSITIONS CONTAINING THEM |
| 4527. | PI 89000002 | MULTIPORT MEMORY |
| 4528. | PI 89000003 | HETEROCYCLIC-ALKYLENE QUINOXALINYLOXYPHEN- OXYPROPANOATE HERBICIDES |
| 4529. | PI 89000004 | SYSTEM FOR COMMUNICATING IDENTIFICATION INFORMATION AND THE LIKE |
| 4530. | PI 89000005 | BLOOD CULTURE ASSEMBLY WITH AND EXTERNALLY ACTUATED VALVE |
| 4531. | PI 89000006 | PROCESS OF PRODUCING A GAS WHICH IS RICH IN CARBON MONOXIDE BY A CRACKING OF HYDROCARBONS |
| 4532. | PI 89000007 | RECOVERY OF CAROTENOIDS, TOCOPHEROLS, TOCOTRIENOLS AND STEROLS FROM ESTERIFIED PALM OIL. |
| 4533. | PI 89000008 | MEDICAL TREATMENT |
| 4534. | PI 89000010 | PROCESS FOR MAKING ALKYL ARSINE COMPOUNDS |
| 4535. | PI 89000011 | SUCTION ENHANCEMENT FOR A WAVY PLATE-FIN. |
| 4536. | PI 89000013 | ISOQUINOLINE DERIVATIVES, THEIR PREPARATION AND THEIR USE |
| 4537. | PI 89000015 | STYRENE-BASED RESIN COMPOSITION. |
| 4538. | PI 89000016 | SUBSTITUTED PYRROLE, PYRAZOLE AND TRIAZOLE ANGIOTENSIN II ANTAGONISTS |
| 4539. | PI 89000017 | [ 5(6)(IH-AZOLE-1-YLMETHYL) BENZIMIDAZOLE] CARBAMATES. |
| 4540. | PI 89000018 | ANGIOTENSIN II RECEPTOR BLOCKING IMIDAZOLES AND COMBINATIONS THEREOF WITH DIURETICS AND NSAIDS |
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