Is the patent written after work useful?

Useful is useful. But whether it's worth it depends on how much you spend. If you are familiar with this industry and can write it easily, it is really worth writing.

Function: It can increase amateur income. No matter what field, there is a great demand now, and there are many materials to buy, no problem.

Comment on the promotion of professional titles. Can make you superior.

Remarks: This is a job invention. It belongs to the company in essence.