What is the biggest difficulty in writing your own patent? What's the difference between invention and utility? Is it true that some people say that practicality is not protected? Thank you for your a

What is the biggest difficulty in writing your own patent? What's the difference between invention and utility? Is it true that some people say that practicality is not protected? Thank you for your answers. Patent format requirements are strict, and poor writing will lead to revision or failure of defense, and even loss of patent.

The protection point is not written in place, and the result is that the protected is not protected, and the patent should not be protected.

The biggest difference between invention and utility model is that invention needs higher creativity and can only be passed after substantive examination. The utility model is not used, but only preliminary examination.