Is Ford Motor Company still selling the Edsel?
Yes or no?
How about Studebaker? Can I buy a new one of those?
If you did not know the answers to those questions, how would you find out?
Well, one way to find out things like that is to use Google site search, for example if you Google:
edsel site:ford.com
You'll find lots of historical information, but no cars for sale.
As I was writing this, I did not know whether or not Ford still sold a Mustang model, so I stopped and did something to find out. Can you guess what I did?
Well, waddya know, it looks like Ford is still selling a Mustang, since having a 2023 model year is a pretty good indication that they are still selling them.
Another great test is what I call the "First verb in the Wikipedia entry" test. The first verb in a Wikipedia entry is usually "is" or "was".
Let's stick with Ford cars for a minute... How about these models:
Escort
Torino
Fiesta
Focus
Bronco
How might you go about figuring out whether Ford still makes and sells those models?
Trademarks are distinctive names given to things by their makers in order to distinguish them from other things in the marketplace because they are trying to sell those things. Typically, when someone is trying to sell something, they don't hide it.
So, does the Coca-Cola company still sell a diet soft drink called Tab?
When I typed that question, I actually had no idea. Within a fraction of a second of looking for the keywords Coca-Cola and Tab, Google produced this:
What's the first verb in that Wikipedia entry?
And not only that, but I don't even need to read more than the Google squib to see "discontinued in 2020".
You know what you don't get? You don't get links to Coca-Cola selling or advertising Tab.
A joke from Back to the Future, which won't make sense anymore:
Maybe I'm missing something, but I don't think the question of "Is someone selling something called '(whatever)' or not?" a difficult question.
Think of a product from long ago - Nehi soft drinks, Twenty Mule Team detergent, or Burma Shave... pick something you liked as a child and don't know if it exists anymore. Breakfast cereals are a good category for that one. Even Google's "related questions" knows why people search for some things...
Now, it just so happens that there is something of a minor industry in reviving old marks. There are long-dead marks like RCA or Victrola which still have some nostalgic afterglow, and which some people revive. One well-known example of that is Indian Motorcycles, which was a major brand decades ago, went out of business, and was revived as a brand by completely different people. Shinola is another good example of that sort of thing.
But, good golly, if your starting point was, say, a US trademark registration that is eight years in to its current ten year maintenance period, then you have the name of a manufacturer, the trademark, and you can access the last-filed specimen of use online. It should not take some kind of detective work to figure out "Does X Corp. still make Y brand products?"