SparkFun, an electronics company, successfully defended itself against a patent troll, Altair Logix, which dropped the case after SparkFun spent $12,645 on legal fees. The patent in question had actually expired, and SparkFun's lawyers were able to uncover this fact and use it to their advantage. The company's experience highlights the challenges of dealing with patent trolls and the importance of fighting back against frivolous lawsuits. By sharing their story, SparkFun hopes to inspire others to do the same and create a more difficult environment for patent trolls to operate in.