ORIGINAL: mwd
Which kind of brings me to a pointless pondering.
2 words: Monster Cable. Both common.
The word Monster has been TM to other parties prior to their use in other context.
The word Cable has been TM prior to Monster Cable to other cable interest.
How could Monster even TM this combo without infringing on someone?
And if they are going after people using 1 of these 2 words, which has already been TM'd to others couldn't ABC Cable sue Monster for using the word Cable if their TM pre-dated Monsters?
I don't get the logic or legality of you "can't" use Monster but we "can" use Cable.
Trademark is not copyright. Trademark is a somewhat murkier world, and there can easily be hundreds or thousands of registered and unregistered trademarks that use similar wording and that co-exist in perpetual prosperity and happiness.
Forget about any laws or anything for a minute, the purpose of a "trade mark" is some kind of mark or word or logo or whatever that identifies you or your business in the marketplace. Before you ever talk to an attorney or a government agency or whatever, if you have a name or a logo for your business, that is a mark you use in trade. You have certain legal protections and moral rights to use it even if you don't register it or put a "TM" after it or whatever (but obviously your protections are stronger if you do).
Let's say you start a diner and call it "Town Diner." Not very imaginative but it works. Even if you don't register it, that's your trademark, and the name you do business under and nothing wrong with it, even though there are probably a thousand other "Town Diners" in the world. And it is a trademark for each of them. As long as there's no confusion, as long as nobody's trying to capitalize on someone else's name, no big deal. Just like Joe's Garage or whatever.
But let's say someone else opened another "town diner" in town, or let's say you are successful and decide to start a chain or franchises and you register the Trademark and expand to other towns that already have a "town diner," which may predate your registered trademark. These are problems, and they are stickier and murkier and less clear-cut than copyright issues. Ideally, you could figure out a way to sort this out somehow with the other party. Maybe one will agree to use a distinctive logo and change their name to "Mary Morton's Original Town Diner" if the other party will pay for the new signage and printed materials or whatever.
Given that neither party was trying to rip the other one off, and both have more or less legitimate claims, people will usually try to come to a semi-amicable solution. If that doesn't work then the courts will have to try and figure out what's fair and settle the matter somehow.
That's an example of a difficult case to decide. A much easier one is when there is bona-fide clear infringement. For instance, someone sets up a "Town diner" designed to look like a part of your chain without your permission. This is clear infringement. Or a competitor uses you name in their own promotional materials, such as "Same recipe as Town Diner!" or "former chef of town diner!" Or someone wants to sabotage your business and sends out coupons with your name that say "buy one rat-booger pizza and get a second one free!" or whatever.
Believe it or not, the law *is* actually designed to follow common-sense principles of fairness and reasonable behavior. It is not designed to be a system of complex traps that arbitrarily ruins lives because someone forgot to say "Mother May I" three times before turning on the lights. Trademark law is not intended as a natural resource to be exploited by lawyers to extract intellectual property from regular workaday businesses.
If you started a company called "monster audio cable" to try and pass off cheap cables under the monster brand then they would have every right to sue you to kingdom come. But if you make horror movies about monsters, that has nothing to do with monster cable. You don't owe them anything and there's no reason that you can't go right along calling your movie "Monster" or whatever.
Cheers.