US Patent 7259359 Automated glass entrance door assembly for walk-in coolers

An automated glass cooler entrance door assembly for an opening in a walk-in cooler comprising at least one fixed, stationary side door that defines a walkway about the opening for ingress and egress into the cooler, at least one opposing sliding door operatively suspended from a concealed drive mechanism above the opening to slide sideways from a closed position across the opening to close-off the cooler to and from an opened position overlapping the fixed stationary side door to allow customer ingress and egress to the cooler via the walkway through the opening and each of the doors comprising heated glass that is electrically connected to electrical power to heat the same.