Q&A: Does A Defective Address Affect Patent Rights?

Japanese paperwork is exacting and precise. What happens, then, if you are an applicant or patent owner and your address as registered by the JPO is incorrect or outdated? Do you lose patent rights in Japan if the address on the Certificate of Patent is wrong?

No, you will not directly lose your rights . . . but you could indirectly, yes, if the JPO does not have your actual address!

Patent rights themselves are safe once a patent is granted and issued. There might be an error in the applicant's address, the patent rights remain the applicant's under patent law.

A sticky issue can arise when an invalidation trial or opposition is filed against someone's patent and the JPO issues a notice to the patent owner(s). It usually will send the notice to the representative counsel (i.e. designated patent agent). However, if the representative counsel cannot or will not handle the case, then the JPO would try to reach the patent owner by mailing the notice directly to the