US 6514988
Condensed-ring thiophene derivatives, their production and use
expired A61PA61P5/04A61P5/24
Quick answer
US patent 6514988 (Condensed-ring thiophene derivatives, their production and use) held by Takeda Chemical Industries Ltd. expires Mon Jan 30 2023 00:00:00 GMT+0000 (Coordinated Universal Time). Status: expired.
Key facts
- Applicant
- Takeda Chemical Industries Ltd.
- Grant date
- Tue Feb 04 2003 00:00:00 GMT+0000 (Coordinated Universal Time)
- Expiration
- Mon Jan 30 2023 00:00:00 GMT+0000 (Coordinated Universal Time)
- Claims
- 4
- CPC classes
- A61P, A61P5/04, A61P5/24