(2) need. Because this patent has been approved in Japan and is protected by Japanese patent law, if the products produced according to this patent are sold back to Japan, China enterprises need to pay the license fee for this Japanese patent to Japanese companies.
(3) No need. The Japanese patent has not been applied for and approved in countries and regions outside Japan. If the products produced according to the patent are sold in these countries and regions, they will not be protected by the laws of these countries and regions. Therefore, China enterprises do not need to pay the license fee for the patent to Japanese companies.
(4) The technology may still be of use value. The expiration of a patent means that the patent right is invalid, the rights of the obligee lose legal protection, and the technology enters the public domain, but it does not mean that the technology itself is invalid. As long as the products produced according to the patented technology are needed by the market, the technology still has the use value, but there is no need to pay the patent license fee.