Hi - my name is XXXXX XXXXX I'm an Intellectual Property litigation attorney. Thanks for your question.
Having an attorney do this for you will be more meaningful to the recipient because they will know that you're serious and that you have engaged an attorney are are ready to proceed if they don't try to resolve your issue short of formal litigation with the USPTO - - which can be very expensive. In other words, a letter from an attorney will be taken much more seriously than a letter from yourself.
As far as costs, a letter should not be very expensive - - especially if you have done most of the footwork in gathering information and content for the letter. So, you should expect a letter to maybe run a few hundred dollars (which would include some time for reviewing your documents, etc.).
Thank you for your reply to my questions. Could you send me your contact information so that we can proceed. I tried unsuccessfully clicking on your name to get more info about you. Please call me at XXX-XXX-XXXX or XXXXX@XXXXXX.XXX
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