Legal Question in Disability Law in California

The ideal lawyer would be the lawyer whom you hired to write the contract with this company. Evidently you didn't consult a lawyer, I hope for your sake there is at least there is some kind of written agreement. You can sue them for disgorgement of the profits they made through the use of your design. Ask for the moon and the stars. I would be pleased to speak with you about this matter. Watch out for legal time limits.

You can seek damages in a lawsuit for whatever your agreement was. You will have to prove what that was. Hopefully you have some documents that contain the terms of the agreement. If you were paid by the company to do a design, it becomes and remains their property, unless your written agreement specifies what rights you retain. You pursue your claim by filing suit in court and serving them. You need a litigation attorney to do this right, meaing as well as possible under the circumstances of apparently not having a contract to go on. If serious about doing this, feel free to contact me.