3 years ago, I signed over a design concept to be produced by a company. It is not protected by an industrial patent in Europe, only registered as being owned by the company. The company has not produced the concept because it cannot afford to. I want to take the idea back and take it to the US for production under a new name but with "my" same design concept. The concept has never gone public in Europe or anywhere else because the company lacks the personnel to produce it. Can I still take the design concept to US, have it patent or registered there and proceed with production?