Inventors should have several patents.

3 items and above. According to the provisions of China's patent law, there are three kinds of inventions that can be protected by patents: inventions, utility models and designs, of which invention patents are the most important. Generally speaking, the achievements made in the process of technology development and new product development should apply for invention patents because of their high technical level. For example, the application of laser technology has been developed, synthetic leather has been manufactured by laser holography or grating lithography, and holographic grating synthetic leather has been developed. Then, both the leather itself and its manufacturing method should apply for invention patents. Another example: drugs developed by biochemical technology, whether drugs or methods of manufacturing drugs, should apply for invention patents. Another example is that a factory has put forward a design scheme to improve the air compressor, which is feasible, and the effect after implementation will greatly reduce the production cost and improve the performance of the machine, so the scheme can be applied for an invention patent.