You can, and if you do it is like driving 10 miles over the speed limit - illegal and no excuse that others do it. If you don't want to break any...

For a slogan, or phrase, (I've been thinking of) for t-shirt design, do I need to register, do a search to use that slogan?

If your slogan is a generic expression (e.g., "Do the right thing." or "Joy to the World" or "Hi There!"), that expression or design is likely not...

Can I include someone's copyrighted image or content by merely mentioning their name?

The answer to your first question is NO, you do not get permission or license to include someone's copyrighted image by mere attribution, unless...

Can I get a trademark for a slogan that I have been using in my radio ads?

Sounds and jingles can be registered. The NBC notes are registered. "Nationwide is on your side" is registered. There are a number of audio...

If I own the trademark to a band name, can I legally...

Like Attorney Ross, I have handled a number of these before. You may bluff your way through this with the right music attorney, but legally you...

Do non disclosure agreements mean that person can't claim your invention?

If "this prototype company" is Davison Design & Development, you are about to get fleeced so be very careful. What you describe sure sounds like...

Can I start an online business trading under a name if it is trademarked in the USA?

You can until a Judge or cop stops you. And, you will likely pay large damages if you do. "I found the name has been trademarked already" is a...

What's the best way to find a lawyer to work on contingency for a intellectual property/copyright infringement case?

First, unless there is over $1M in damages, no contingent fee litigator is going to take your case, even if registered art and clear infringement....

My corporation was sued for trademark infringement and they listed my company AND me personally. Can I legally represent myself?

Legally you cannot represent the company as attorney. It is the company you want defending this case, not you personally. The main reason to set up...

Can I write a screenplay about the life of a person who died in 1897 when someone else has already written a book on same?

Hmm. You are worried about the book but saying you are not using the book as a source. I suggest you see a copyright lawyer, as your admitted...