Click "Patent Search" to enter the search page for advanced search, and you can enter the name or patent number or patentee.
It is best to know the patent number of the general drug patent. For example, "olanzapine" is just a product name, not necessarily a patent name. Chaolan Zaping may not find its patent.
In addition, as an invention patent, the protection period of drugs is 20 years, counting from the date of application. If the annual fee is not paid, the patent right will be automatically lost in the year when the annual fee has never been paid.