Even if you already have a trademark you should monitor it so no one else infringes your exclusive rights. If you want to the consultants at PRV InterPat are more than willing to help out with monitoring your trademark. Here you can also find links that might be helpful if you want to conduct searches on your own.
Use our services online or forms if you wish to change something in your registration. Here you can also read about how to go about it if you want to transfer, license or pledge your trademark.