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| assignee | number of patents |
|---|---|
| Abbott | 55 |
| Smithkline Beecham | 24 |
| Novartis AG | 16 |
| AstraZeneca | 15 |
| Pfizer | 14 |
| Warner Lambert | 11 |
| Boehringer Ingelheim | 10 |
| Dana Farber Cancer Inst. | 10 |
| Bayer AG | 8 |
| Glaxo Group | 8 |
| Hoffmann La Roche | 8 |
| Merck & Co | 8 |
