The first question is that the patent belongs to the patentee, that is, the applicant. Even if you are signed with the name of the inventor, you cannot use it without authorization unless listed as the applicant or ** *There is still discussion with the applicant.
If the invention is completed by you in the company using company resources, it is a service invention. The patent right belongs to the company and there is nothing to dispute. Of course, you can require the inventor's signature. If the invention is an independent invention, you should, if you have evidence, you can find a way to get the patent back.