Group 1 - The State Intellectual Property Office of China granted a patent titled "Glass Plate Liquid Level Meter and Liquid Level Measurement Method" to China Petroleum & Chemical Corporation, Sinopec Guangzhou Engineering Co., Ltd., and Sinopec Refining Engineering Group Co., Ltd. The patent authorization announcement number is CN115406501B, with an application date of September 2021 [1] - China Petroleum & Chemical Corporation, established in 2000 and located in Beijing, primarily engages in oil and gas extraction. The company has a registered capital of 12,173,968.9893 thousand RMB. It has invested in 263 enterprises, participated in 5,000 bidding projects, holds 45 trademark records, and has 5,000 patent records, along with 40 administrative licenses [1] - Sinopec Guangzhou Engineering Co., Ltd., founded in 1998 and based in Guangzhou, focuses on professional technical services. The company has a registered capital of 30,000 thousand RMB. It has invested in 2 enterprises, participated in 4,291 bidding projects, holds 4 trademark records, and has 863 patent records, along with 22 administrative licenses [1] - Sinopec Refining Engineering Group Co., Ltd., established in 2007 and located in Beijing, primarily operates in water management. The company has a registered capital of 441,854.35 thousand RMB. It has invested in 12 enterprises, participated in 63 bidding projects, holds 5,000 patent records, and has 4 administrative licenses [2]