These startups both released groundbreaking induction stoves. Now they’re embroiled in a lawsuit

Impulse, a sleek induction stove that began shipping to customers last year, advertises itself as “unlike any other induction stove ever made.” But that product is now at the center of a legal fight. Copper, another company making next-generation induction stoves, sued Impulse on Friday in federal court in Delaware for patent infringement. At the center of the dispute is a shared design choice: Both companies build stoves with batteries tucked inside, a feature that boosts performance, eas...