In addition, the X86 instruction system involves copyright, and the copyright will expire in many, many years.
Expired patent inquiry
Log in to ipr.com/, CNIPR Chinese and foreign patent database service platform, enter the patent application number to be queried, enter the patent specification search page, and check the "legal status" column. If it is "authorized", the patent is legal and valid; If the patent expires and the annual fee is not paid as required, it is an expired patent, and you can use the patent for free.
Attachment: 20 1 1—20 12 Examples of major brand drugs with expired patents in the world:
20 1 1 Major brand drugs with expired patents:
Advair (rosiglitazone), Plavix (clopidogrel), Zyprexa (olanzapine), Effexor XR (venlafaxine), Aprovel (irbesartan), Xalatan (latanoprost), Astelin (azelastine), Synarel (naline) and Actos (pioglitazone).
20 12 main brand drugs with expired patents:
Crestor (Rosuvastatin), Symbicort (Budesonide/Formotero), Singulair (Montelukast), Maxalt (Rizatriptan), Avandia (Rosiglitazone), Zometa (Zoledronic Acid), Diovan (Valsartan), Lexapro (Edeplon), Cipralex (Ede).