Do I have to respect someones trademark infringement claim, if their application is still pending?

Yes. Trademark rights can exist at common law even without a registration. That does not mean that defenses are unavailable -- if true, a term...

If you are delivering their product, and if they complain, you defense would be nominal fair use. It would be better to have their permission, but...

Can we be required to stop selling these designs even though they do not bear any other company's name or branding?

There could be all sorts of legal theories regarding "designs" so you need to hire a lawyer and show her or him the letter. It could be one or...

Can we sell in USA via a website if are based in Canada? but a company own a registered trademark in usa..

I know a Canadian trademark lawyer who could answer the question specifically regarding Canada. However, as a general rule, both are "common law"...

Will using the same words in different format, logo design, and business category constitute a trademark infringement?

Merely changing the font or logo would probably make no difference -- although it will depend on the words and how different the impression -- but...

Can I start a website using Trade Marks such as the NFL to help better regulate a Fantasy League for videogames like MaddenNFL

It is a tough one. NFL is aggressive about protecting trademarks and probably has one or more licensing programs in place to control who can use...

If a short phrase is Federally registered as a trademark on the Principal Register it is presumed valid. The standard is whether there is a...

If I use my own photo of a manufactured doll in my own CD album artwork, costumed satirically, am I infringing on trademark?

It sounds like you are doing the right things. It might be more of a copyright than trademark issue. Both have fair use defenses, but the elements...

Am I going to have any legal ramifications from creating a complicated card game that uses celebrity and movie likenesses?

If you use a celebrity's (or anyone else's) name or likeness for commercial purposes without permission you violate their right of publicity. It...

Will we have issues getting a trademark because storage exists in both names and more importantly are we now infringing on them?

It would be best if you take steps to protect your rights. I expect what you mean by the other company "has trademarked" is that they registered...