The thing I designed was used by my boss to apply for a patent. How can I get my patent back?

My personal opinion:

While working in the company, I designed the model. His ownership should belong to the company. Because you made the design plan while getting paid by the company. This patent honor belongs to you. At the same time, you can ask the company to provide additional funds in the form of rewards or incentives for the design of this patented solution.