To understand this concept, we must first understand that patents are regional, and patents authorized by each country only take effect within that country. For example, the patent granted by China National Intellectual Property Administration, China is only valid within the scope of China. Therefore, when a technology is produced and sold in many countries, it is necessary to obtain patents from many countries at the same time. For example, at the same time in the United States, Germany, Japan, Russia and other countries at the same time on the same technical content to file a patent application; These patent applications filed in different countries are equivalent patents.