While the US and Japanese trademark system share many similarities, they are separate systems, designed to be enforced and regulated separately. While having an American trademark may help in the application process for a Japanese trademark, it is not a guarantee that a Japanese trademark will be granted.
Trademarks provide protection for unique marks or logos. However, the uniqueness of a mark or logo is specific to each culture. A mark that may be unique and original in America might be too similar to a mark already in use in Japan. Or a trademark registered in Japan may be too close to a religious or cultural symbol to receive protection in America. These cultural differences is why it is best to consult with a local attorney before making an application for trademark protection.
If you have any questions about trademark law in Japan, please contact our office for a legal consultation.