This episode is about an opinion from the United States Court of Appeals for the Federal Circuit in the case of Canatex Completion Solutions, Inc. v. Wellmatics, LLC, decided on November 12, 2025. The core issue of the appeal is whether the U.S. Patent No. 10,794,122, owned by Canatex, is invalid for indefiniteness due to an alleged clerical error in the claims. Specifically, the patent uses the phrase “the connection profile of the second part,” which Canatex argued should be corrected to “first part” because the context of the invention, relating to a downhole oil and gas tool, makes the error evident and the correction the only logical one. The district court had ruled the patent claims invalid, but the Court of Appeals reversed this decision, concluding that the error was indeed obvious on the face of the patent and that changing “second” to “first” was the only reasonable correction that a skilled artisan would recognize. The court's ruling emphasized that judicial correction of claim terms is appropriate when the demanding standard for an obvious error and unique correction is met, thereby remanding the case for further proceedings.

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