Correct me if I'm wrong, but "from a legal standpoint," there has to be evidence of use in commerce before a trademark can be registered, and it's crystal clear that Comodo did not use "Let's Encrypt" in commerce, and it's also crystal clear that ISRG did.
Yes, and then after the mark is approved you have to provide evidence of use, which can be nothing more than a screenshot of a webpage (plus a $250 filing fee). Filing evidence of use can be delayed up to 5 times I believe, meaning you have plenty of time to file. If you fail to file, you will lose your mark though.
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You can also file for "intent to use".
Yes, and then after the mark is approved you have to provide evidence of use, which can be nothing more than a screenshot of a webpage (plus a $250 filing fee). Filing evidence of use can be delayed up to 5 times I believe, meaning you have plenty of time to file. If you fail to file, you will lose your mark though.
I would imagine you lose registration of the trade mark since actually being the first user of the trade mark is enough to claim the trade mark.