Business name advice

[Mark Husar]

I am hoping for a reply to a problem that I am having with my corporate identity.

Problem:
I have spent eighteen years building my company into a strong corporation in the electrical services field. I have recently become aware of at least eight California firms who have filed dba's to do the same type of services using my name.
I am concerned with the possibility that they may get into legal trouble on a project, have financial difficulties or actually screww a lot of people out of a lot of cash and it will reflect badly on me.

Solution:
I have filed for service mark registration with the Secretary of State.
My corporate identity is up to date.

I need to know how to proceed and enforce my claim to my business name.

Thank you,

Mark