How many days does it usually take to write an invention patent?

The time required to write an invention patent depends on many factors, such as the complexity of the patent, the size of the invention and the technical field. Generally speaking, it takes 7- 15 days to write an invention patent, but it may take longer, especially when it is necessary to draw charts, write detailed technical instructions or communicate with inventors many times. If the agent is experienced, the invention patent will be written faster. The application procedure for invention patent is complicated, and it needs to go through the stages of acceptance, preliminary examination, publicity and authorization, so the whole application process may take several months or even longer. If you need to speed up the application, you can entrust a professional intellectual property agency to apply.