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This brief report illustrates a method to extract and analyze patent data relating to the industrial synthesis of ammonia. The research was performed on Espacenet and Orbit Intelligence with a combination of keywords and classification symbols. The main classification codes are C01C 1/02 (Preparation of ammonia), C01C 1/04 (Preparation of ammonia by gas phase synthesis), C01C 1/405 (Preparation of ammonia by gas phase synthesis from nitrogen and hydrogen in the presence of a catalyst), and C25B 1/27 (Electrolytic production of ammonia).