I'm thinking of trademarking a slogan, it was used by someone else but it looks like it's not registered?

Yeah, this sounds more or less like trademark-squatting, which isn't allowed. 1. You only have a trademark if you're actually USING the...

Can I print and sell my adobe illustrations of different movie stars?

Not only could this constitute copyright infringement, but, depending on where you're selling the illustrations, you might also potentially violate...

If a third party notifies the USPTO, will the USPTO investigate or take action to identify/investigate bad faith?

As you said, the USPTO is first come first serve (with some exception, typically regarding foreign filings). That you have documentation relating...

Is it legal to paint analogies that include copy written fictional characters as part of a philosophical essay?

What do you mean by "paint an analogy?" You might be able to justify your use of the characters in your essay under the doctrine of fair use, but...

The ultimate question is whether the USPTO would find your trademark "likely to confuse" consumers. In other words, would consumers mistakenly...

The specimen must show the mark in use on the actual goods and services for which you applied -- the clothes. If your clothes have tags or labels...

Can I publish a book of pictures that I took of publicly accessible objects?

This raises a couple issues: 1. Are the "objects" copyright-protected material (e.g. artwork)? 2. If the objects are copyright protected,...

As Steven said, this is really fact specific. Trademark infringement depends on a number of factors: the similarity of the marks, the similarity of...

Can I publish informative tutorials / guides about how to stream movies / series / TV Channels for free?

This sounds mainly like a copyright issue, specifically the Digital Millennium Copyright Act. The DMCA prohibits circumventing copyright management...

Do I need seperate trademark protection for promotional materials?

Moreover, in the hypothetical situation that you had a registered trademark for use with your produce, the registration would only protect use of...