# Introduction Patent descriptions are a crucial element for protecting inventions. However, the specific legal standards that must be met can be complex and difficult to evaluate. The Pat-DEVAL team has presented a new evaluation framework for patent descriptions called Chain-of-Legal-Thought Evaluation. ## How Pat-DEVAL works Pat-DEVAL uses large language models to evaluate the structural coherence and statutory compliance of patent descriptions. This approach introduces a technique called Chain-of-Legal-Thought (CoLT), which provides a connected reasoning mechanism for analyzing patent descriptions. ## Experiment results Experiments have shown that Pat-DEVAL outperforms baseline metrics and existing LLM evaluators, achieving a correlation of 0.73 in Legal-Professional Compliance. This result is significant, as it demonstrates that the framework can capture statutory compliance with a high degree of accuracy. ## Implications for industry The success of Pat-DEVAL has important implications for the patent industry. With a more precise and reliable evaluation framework, developers can create automated drafting systems that meet legal standards with a high degree of accuracy.