sohio Former gas company with headquarters in Cleveland Former Cleveland oil company acquired by BP Early gas company based in Cleveland Co. founded by the Rockefellers Bygone Buckeye State company British Petroleum took majority ownership of it in 1978 BP acquisition of 1978 1991 BP acquisition 1987 BP acquisition Old Buckeye State service station name Bygone gas brand Co. founded by Rockefeller 1987 BP purchase Old oil company that was headquartered in Cleveland Old Cleveland-based gas company