Since nobody answers, let me give my opinion on this.
1) To the best of my knowledge, you cannot patent or even copyright a word.
A patent is a property right for an invention, while "A trademark is a word, name, symbol or device which is used in trade with goods to indicate the source of the goods and to distinguish them from the goods of others. A servicemark is the same as a trademark except that it identifies and distinguishes the source of a service rather than a product. The terms "trademark" and "mark" are commonly used to refer to both trademarks and servicemarks."
No problems with two letters trademarks. See:
http://www.cepani.be/dec4014.pdf
2)AFAIK, as far as you don't infringe in someone else's industry under the same TM-ed name, yes.






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