A priority certificate provides official proof of a patent application in Japan. This request can be made by filling out and submitting a form, along with a small fee. The form needs to be submitted in Japanese.
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.
For an invention to be patentable under Japanese law, the invention must have been “created.” Creation requires some sort of human intervention in the process of generating the invention. Therefore, simply discovering a natural product does not count as “creation” and natural products cannot generally be patented.
Plaintiffs who feel that their patent was denied improperly can appeal the rejection of a patent application through the Japan Patent Office rather than resort to the courts. This appeal must be made within three months of the rejection.