From June 1879 to June 10, Edison successfully made an incandescent light bulb with carbon fiber as the filament, which was called "carbonized cotton filament incandescent lamp". Later, it was put into mass production, and a company was established to establish corresponding infrastructure such as power stations and transmission networks, which soon made electric lights widely used in the United States. During this period, he constantly improved his technology, and finally decided to use tungsten wire as the filament, which is called "tungsten lamp" and has been used ever since, so Edison became a recognized inventor of electric lamp.
Characteristics of invention patents
1, it is difficult to apply.
In view of the creativity of the invention patent, China requires that the invention has outstanding substantive characteristics and remarkable progress compared with the existing technology before the application date; For the utility model, it is only required to have substantial characteristics and progress compared with the existing technology before the application date. The invention emphasizes "outstanding substantive characteristics" and "remarkable progress", which shows that the creative requirements of invention patents are higher than those of utility model patents, and its application is more difficult.
2. High technical value
Because the application for a patent for invention requires higher creativity of the technical scheme, and requires not only formal examination but also substantive examination, the invention that finally obtains the corresponding patent right has higher technical value. For example, the number of invention patents can be used as an important index to apply for listing on the science and technology innovation board. In addition, if an enterprise has a certain number of invention patents, it is also beneficial to be recognized as a high-tech enterprise and apply for government-funded subsidy projects.