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| Number | Title | Issue Date |
| 7521477 | Vitamin C derivatives with peptide, preparation method thereof and composition comprising the same Disclosed are vitamin C derivatives linked with a peptide or a pharmaceutically acceptable salt thereof, a method of preparing the same, and a composition comprising the same. ... | 04/21/2009 |
| 7399486 | Method of preparing mixed formulation of sustained release microspheres by continuous one-step process Disclosed is a method for preparing a mixed formulation of sustained release microspheres with various compositions by a continuous one-step process. The present method is characterized by preparing the mixed formulation of sustained release microspheres with differ... | 07/15/2008 |