A room-temperature superconductor is a material that is capable of exhibiting superconductivity at operating temperatures above 0 °C (273.15 K). While this is not strictly "room temperature", which would be approximately 20–25 °C, it is the temperature at which ice forms and can be reached and easily maintained in an everyday environment. In February 2019, US Navy filed a patent claiming that a room-temperature superconductivity can be achieved using a wire with an insulator core and an aluminum lead zirconate titanate.