Does buying things from regular manufacturers constitute patent infringement?

Yes If the products purchased by your company are used for profitable activities such as production or sales, it will constitute patent infringement. If you have evidence to prove that your product belongs to a legal source, you can be exempted from liability for compensation by taking the responsibility of stopping the infringement. Patent right is the exclusive right to protect the intellectual labor achievements of the patentee. Patent infringement refers to the illegal acts of others who, without the permission of the patentee, exploit valid patents protected by law for the purpose of production and operation.