The infringement exists even if the infringer did not know about the patent. 即使侵权人不了解专利侵权依然存在。
And the fourth chapter puts forward effective remedies for patentee and legitimate demurrers for the accused patent infringer. 第四章结合专利间接侵权的具体特征，提出了对于专利权人切实可行的救济措施以及被控侵权人可资抗辩的事由。
