<P> By the 1980s, most companies were using their individual brand names instead of the Standard name, with Amoco being the last one to have widespread use of the "Standard" name, as it gave Midwestern owners the option of using the Amoco name or Standard . </P> <P> Three supermajor companies now own the rights to the Standard name in the United States: ExxonMobil, Chevron Corp., and BP . BP acquired its rights through acquiring Standard Oil of Ohio and Amoco, and has a small handful of stations in the Midwestern United States using the Standard name . Likewise, BP continues to sell marine fuel under the Sohio brand at various marinas throughout Ohio . ExxonMobil keeps the Esso trademark alive at stations that sell diesel fuel by selling "Esso Diesel" displayed on the pumps . ExxonMobil has full international rights to the Standard name, and continues to use the Esso name overseas and in Canada . To protect its trademark Chevron has one station in each state it owns the rights to branded as Standard . Some of its Standard - branded stations have a mix of some signs that say Standard and some signs that say Chevron . Over time, Chevron has changed which station in a given state is the Standard station . </P> <Ul> <Li> <P> One of 15 Chevron stations branded as "Standard" to protect Chevron's trademark; this one is in Las Vegas, Nevada . </P> </Li> <Li> <P> A combination gasoline / diesel pump at an Exxon in Zelienople, Pennsylvania selling Exxon gasoline and "Esso Diesel". </P> </Li> <Li> <P> BP station with "torch and oval" Standard sign in Durand, Michigan . </P> </Li> <Li> <P> BP continues to sell marine fuel under the Sohio brand at various marinas on Ohio waterways and in Ohio state parks in order to protect its rights in the Sohio and Standard Oil names . The Anderson Ferry Marina near Cincinnati, Ohio is pictured . </P> </Li> </Ul> <Li> <P> One of 15 Chevron stations branded as "Standard" to protect Chevron's trademark; this one is in Las Vegas, Nevada . </P> </Li>

How did standard oil become the first monopoly in american history