The story of the Bionic Wrench versus Craftsman, which bills itself as “America’s most trusted tool brand,” also raises questions about how much entrepreneurs and innovators, who rely on the country’s intellectual property laws, can protect themselves. For the little guy, court battles are inevitably time-consuming and costly, no matter the outcome.

Still, the inventor of the Bionic Wrench is determined to fight. He is Dan Brown, an industrial designer in Chicago who came up with the wrench after watching his son try to work on a lawn mower. Mr. Brown says he believes that the Max Axess wrench copies his own and he is planning to file suit against Sears, which declined to answer any questions about the wrenches for this article.

The Bionic Wrench is distinguished by its gripping mechanism, a circle of metal prongs that, inspired by the aperture in a single-lens reflex camera, descend evenly to lock onto almost any nut or bolt.

Since Sears has halted new orders, the Pennsylvania company that makes the Bionic Wrench has had to lay off 31 workers, said Keith Hammer, the project manager at the company, Penn United Technologies. “And that’s not to mention our suppliers,” he added.

Mr. Brown sees a broader issue than just the fate of his wrench. “Our situation is an example of why we’re not getting jobs out of innovation,” he said. “When people get the innovation, they go right offshore. What happened to me is what happened to so many people so many times, and we just don’t talk about it.”