Generally, patent rights initially vest with the person who conceives of the invention or contributes the inventive step. Since an employer who hires someone else to do the work cannot provide the inventive step, the employer cannot be the inventor. For example, if a company hires an independent contractors, patent rights initially vest with the independent contractor and the company cannot be named as an inventor. If the company wants to license or otherwise exploit the invention, then the company must acquire the patent rights from the independent contractor through an assignment.
Companies should negotiate with the independent contractor an assignment before hiring the independent contractor. On the other hand, the independent contractor should realize that by signing away rights to any inventions, he or she may be foregoing significant economic benefit. Problems arise when the company does not have an agreement by the independent contractor to assign inventions to the company. In this situation, the independent contractor owns the invention even though the company hired the independent contractor. The company may have a license or the right to use the invention due to the nature of the relationship between the independent contractor and the company, but this right to use may not extend to the ability to license the invention to other parties.