@ucbalumnus is correct about a science degree for patent law- but don’t put the cart before the horse!
Follow what you are genuinely interested in, and use work placements and internships to get a taste of the ways those translate into actual work. What you like about chemistry, what interests you about law and what you are happy to spend 40 years of your life actually doing all day may have a big shared space in your Venn diagram- or might have little to none.