Are patents useful for further studies and job hunting? Can it play a plus role?

Yes, it can definitely play a role in adding points. But these all represent your past, and now enterprises pay more attention to your future potential and value. During the interview, you should let the interviewer see that your ability still exists, and let the interviewer feel that you will create more benefits for the company. You must straighten out your own thinking, list your own advantages from your own ability, match the company's situation, and be clear-cut and give people a sense of stability and care.

Personal opinion, I hope I can help you.