Medical device company AliveCor is suing Apple for allegedly infringing on three of its patents for remote cardiac monitoring, reports MSN.

AliveCor alleged in its lawsuit filed in the U.S. District Court for Western District of Texas on Monday, that the Apple Watch Series 4’s electrocardiogram (ECG) functionality infringes on three patents of the company that relates to using wearable sensors in order to improve cardiac monitoring.

The complaint states that they have patents that are “state of the art in arrhythmia diagnosis.” They also explain “the limitations in known diagnostic techniques and diagnostic equipment, and the need for the inventors’ improvement in diagnostic techniques and equipment.” More particularly, the concerned patents were 9,572,499, 10,595,761 and 10,638,941.

Read more on MSN.