1. According to what you said, this patent should be applied in the name of the original company, so the patent belongs to the company, and you are only the inventor (designer). Therefore, it is not planned to use this patent in the new company. If it is used, it will infringe the original patent right.
2. You can force the company to use it for you in another way, that is, according to the patent law, the company should give you rewards and remuneration. If you don't give it, you can talk to the company, and if you can't reach an agreement, you can sue. How much is the specific reward and remuneration? You can refer to the webpage link of this article "Money you may never receive: Talk about the remuneration of inventors".
An invention-creation that is performed in accordance with Article 6
of the Patent Law or is mainly accomplished by using the material and technical conditions of the unit is a service invention-creation. The right to apply for a patent for a service invention-creation belongs to the entity; After the application is approved, the entity shall be the patentee.
the right to apply for a patent for a non-service invention-creation belongs to the inventor or designer; After the application is approved, the inventor or designer shall be the patentee.
in the case of an invention-creation completed by utilizing the material and technical conditions of the entity, if the entity has entered into a contract with the inventor or designer to stipulate the right to apply for a patent and the ownership of the patent right, such agreement shall prevail.
Article 16
The entity that has been granted the patent right shall reward the inventor or designer of the service invention-creation; After the patent for invention-creation is implemented, the inventor or designer shall be given reasonable remuneration according to the scope of its popularization and application and the economic benefits obtained.