Blowing out the candles on a birthday cake is a grand tradition to celebrate the passage of life and hopes for its future. But it's also somewhat unsanitary. It's done with the breath of the celebrant and therefore contaminates the cake with the blower's germs.
In 2014, Brian Donnelly of East Northport, NY received a patent for a series of shields that cover different sized cakes with perforated shields that allow for the passage of candles while providing some protection for the cakes.
Donnelly provided six different designs to reflect a variety of cakes, including circular cakes, layer cakes, cupcakes, and pies.
-via Weird Universe