In a filing filed in court on Friday, Microsoft accused Foxconn of failing to provide twice-yearly patent reports on certain products. The lawsuit was filed in the Northern California District Court.
Microsoft asked Hon Hai to pay patent royalties and interest, and to review its books and lawyer fees.
According to the indictment, Foxconn agreed to be audited by third-party Deloitte in 2017, but did not provide any documents required by the company.
It is not clear which products are covered by the patent licensing agreement. However, Microsoft said in 2013 that it had reached a patent licensing agreement with Hon Hai for Android and Chrome OS devices. Copies of the agreement have been submitted to the court, but remain confidential.
In response, Hon Hai issued a statement yesterday saying that the group did not comment on ongoing judicial cases.