I collect old oil company roadmaps and have a soft spot for oil company memorabilia. A quick primer....back in the early days there were two groups of companies...the Standard combine (Rockefeller) and the independents (Gulf/Sun/Phillips/Union/Marathon/etc). The Standard combine was broken up on antitrust grounds and the smaller "Standard of" were created, which had rights to the Standard name in their marketing areas. They then combined over the years (the main ones were Chevron-Standard of California; Amoco-Standard of Indiana, Kyso (Standard of Kentucky), Sohio (Standard of Ohio), Socony-Vacuum (Standard of New York-Mobil) and Standard of New Jersey (which was Esso/Exxon/Humble/Oklahoma). These companies had rights to the name Standard when related to petroleum products in their territory (so you had things like Sohio using the Boron name in states surrounding Ohio; Standard stations in the Midwest were known as Amoco stations in other parts of the country/world (there are some cool Amoco ads from Australia on Youtube). In the 60s-70s with more national media governing advertising, the "two name" function essentially became less useful, and you had companies buying and selling (Chevron bought Kyso, for instance) and renaming (So-NJ to Exxon; So-NY to Mobil). Each of the companies, though, for trademark purposes retained a single station in each of their territories/states using the Standard branding. My dad was in the petrochemical business, so I grew up paying attention to this type of thing.