How to use "patches" in a sentence

Carlton Dombey, a curly-haired man with a bushy mustache, stood at the window, blotting his damp hands on his medical whites and peering anxiously through one of the few frost-free patches of glass

For the most part, Reno's streets were clean and dry in spite of a recent snowfall, though occasional patches of black ice waited for the unwary motorist

Plows had kept the blacktop clean, except for scattered patches of hard-packed snow that filled the potholes, and snow was piled five or six feet high on both sides.