US 6267981
Method of producing sustained-release preparation
expired A61KA61K38/27A61K38/28
Quick answer
US patent 6267981 (Method of producing sustained-release preparation) held by Takeda Chemical Industries Ltd. expires Mon Jul 26 2021 00:00:00 GMT+0000 (Coordinated Universal Time). Status: expired.
Key facts
- Applicant
- Takeda Chemical Industries Ltd.
- Grant date
- Tue Jul 31 2001 00:00:00 GMT+0000 (Coordinated Universal Time)
- Expiration
- Mon Jul 26 2021 00:00:00 GMT+0000 (Coordinated Universal Time)
- Claims
- 21
- CPC classes
- A61K, A61K38/27, A61K38/28, A61K9/1647, A61K9/5031