Group 1 - The State Intellectual Property Office of China granted a patent for a "mud pump crankshaft" to Sinopec Four Machine Petroleum Machinery Co., Ltd. The patent number is CN223177956U, with an application date of November 2024 [1] - The patent describes a new design for the mud pump crankshaft, which includes a shaft body, crankshaft support, and connecting disk, all integrated into one piece. This design allows for a direct connection to the gearbox output, improving transmission efficiency and load capacity compared to traditional belt and chain transmission methods [1] Group 2 - Sinopec Four Machine Petroleum Machinery Co., Ltd. was established in 2012, located in Jingzhou, with a registered capital of 600 million RMB. The company has participated in 5,000 bidding projects and holds 645 patents [2] - Sinopec Petroleum Machinery Co., Ltd. was founded in 1998, located in Wuhan, with a registered capital of approximately 955.67 million RMB. The company has invested in 15 enterprises and participated in 1,463 bidding projects, holding 1,644 patents [2]