Butter 2 large baking sheets. Arrange 10 lollipop sticks on each baking sheet, spacing them evenly apart. Stir sugar, corn syrup, and butter in small saucepan over low heat until sugar has dissolved. Slowly bring to a boil, stirring frequently. Continue cooking for 7 minutes, or until candy thermometer registers 275 degrees F. Stir in gelatin until smooth. Using a metal tablespoon and working quickly, spoon syrup over 1 end of each lollipop stick. Cool completely. Wrap each lollipop in plastic wrap and store in an airtight container.