The Japanese Patent Office re-introduced the post-grant opposition system in April 2015.

Written by Daniel van Herck :: [Wednesday, 15 April 2015 16:07]
Created Wednesday, 15 April 2015 Hits 556 views

Under the new opposition system any party will be able to file an opposition within 6 month of patent issuance.
The opposition period starts from the publication date of the granted patent publication (JP B1/B2 publication).