When filing a US patent application claiming priority to a corresponding non-English language foreign patent application, it is important to be alert to possible translation errors. If a patent issues with a translation error in the claim, that claim may be held to be invalid for indefiniteness under 35 USC, Section 112. Alternatively, the error in the translation may result in a judge interpreting the claims more narrowly than the original claim, such that an accused product may be found to be non-infringing.