If you look many new companies that have website developed have only .com and are not tredemarked. I mean look at Namerific or Brandbucket clients.
But as I read this forum different persons have defferent opinion about this situations.
Someone wrote on this forum:"You can claim TM rights without having a registered TM. Registered TM just makes it official and more difficult to challenge.
If you buy that domain with the knowledge that there is a company developing a product by the same name, it would be easy for them to argue that you are holding the domain hostage while having no legitimate use for it."
I guess it is all about is person willing to risk it.
Yes, a lot of it depends on your own willingness to risk anything. True, there are a lot of different opinions and thoughts on the matter. A lot of what is good or bad is all up to a person’s own perception and/or knowledge of the subject.
Technically, you can "claim TM rights" anytime you want, with or without having a true TM. However, it doesn't protect you in any type of legal situation. However, there is something known as "first use" when registering a TM - that can then be indicated in the TM to help extend the overall coverage of the TM itself, if that makes sense.
Getting a TM is a process that generally takes a little time. There are also different forms of Trademarks... both Federal and State level (here in the US), and of course, International Trademarks. It's possible you investigate a company and find out that they may only have a State TM (for instance in California), but that they do not have a Federal TM. That can also play a role on what can be done in some cases.
Not to mention, if you FILE for a TM today, it will still take at least a couple of months (in most cases) to finalize/approve a Trademark. However, at the end of the process, and if you have been approved for the TM, your protection would begin, pro-actively, to the point that you originally filed/registered for it. So in that case especially, if you file today - you don't technically have a TM yet. However, you can indicate a Trademark on your logo/site, for instance. Then if the Trademark that you filed finalizes and you are approved – at that point, you can officially represent that you hold a TM and your "first use" would be on the day you filed the TM, and/or a demonstrated date prior to that.
Of course, I will state again, I am NOT an attorney, only sharing what I know of TM’s as I have some experience setting some up myself years ago. For any questions that you really need solid answers for (if you are concerned about a domain you have, etc) – maybe consider taking to an actual trademark attorney and/or at least on a site like LegalZoom, etc.