We understand the need for companies to protect their trademarks, but the biggest names in coffee seem to love punching down at small businesses over minor disputes. Starbucks twice fought — and twice lost — a battle with a small New Hampshire roaster over “Charbucks,“ Caribou Coffee forced a Michigan cafe to change its name, and now Dunkin’ Donuts is threatening legal action against a Massachusetts coffee shop over a slogan handwritten on the store’s window. [More]