Yes. But if your operation is small scale, it is likely not worth it for the patent holder to sue you.
Keep in mind: patents are
legal proof of ownership. There are no patent police out there looking for patent violations. It is the responsibility of the patent holder to find people who are infringing, and sue them (or develop licensing agreements with them in the first place.)
I studied US and international patent law for my senior economics thesis on bicycle innovation. In short: patents provide good tactical leverage for large firms to use when negotiating with each other, but are mostly irrelevant/ineffective for individual inventors.
Also if you're afraid of the imaginary patent police, keep in mind:
Patents: legal ownership of a technique/design/tool
Copyrights: legal ownership of creative material (video, writing, music, etc.)
Trademarks: legal ownership of a
brand: a legitimate claim that a product was produced by a certain company.
At the moment, at least in the US, it's the
copyright police which are scary--not the patent police.