The works of Harry Turtledove, and occasionally Laura Frankos, feature many real-world product brand names and incorporate them into the story - e.g., McDonald's, Coca-Cola, Walgreen's, etc. However, they also feature numerous fictional products, particularly in alternate history stories, or works set in the future. While some of these fictional products are crucial to the plot of a given work, most are passing references meant simply to provide momentary background color to a fictional world, often serving as inside jokes.
Throckmorton car, the most luxurious railroad car of the 19th century, presumably an analog of the Pullman car. In "The Scarlet Band," we learn that trains in the United States of Atlantis do not have these, much to James Walton's chagrin.[1]
6+, described by Beckie Royer as a fizz, lemon-limey, on the order of Sprite (an OTL brand which apparently exists in this alternate).[7] The name seems to be a multi-layered reference to the real-world brand 7 Up and Turtledove's own story "6+" (part of the Earthgrip series) which, in turn, comes from a soft drink in Robert A. Heinlein's novella The Man Who Sold the Moon.
Universal Protective Services, advertised as the best on Saugus. At the end of "The Great Unknown," Professor Jennifer Logan, now an unwilling celebrity, makes a call to this agency.[12]
The Unvarnished Truth, a disreputable tabloid newspaper in the Federacy. When trying to find a soapbox for their Jeng Ho whistle-blowing, Stavros Monemvasios and Andrea Dubois quickly discount this option.[13]
Dr. Hopper[15] is the name of a carbonated beverage created in the Confederate States in the years after the Second Mexican War. By the time of the Second Great War, it is a widely popular drink among all Confederates, both black and white. It is likely an analog of Dr. Pepper.